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#63 by Harvey P. Dale at Tue Dec 26 17:36:52 EST 2023
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#62 by Harvey P. Dale at Tue Dec 26 17:36:49 EST 2023
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| MATHEMATICA
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LinearRecurrence[{3, -3, 1}, {1, 5, 15}, 50] (* Harvey P. Dale, Dec 26 2023 *)
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| STATUS
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approved
editing
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#61 by Jon E. Schoenfield at Sat Feb 05 16:50:10 EST 2022
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#60 by Jon E. Schoenfield at Sat Feb 05 16:50:05 EST 2022
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| COMMENTS
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If Y is a 4-subset of an n-set X then, for n>= >= 4, a(n-4) is the number of 4-subsets of X having at least two elements in common with Y. - Milan Janjic, Dec 08 2007
Equals binomial transform of [1, 4, 6, 0, 0, 0,...] - _, ...] - _Gary W. Adamson_, Apr 30 2008
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| PROG
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(MAGMAMagma) [3*n^2+n+1: n in [0..50]]; // Bruno Berselli, Mar 13 2013
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| STATUS
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approved
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#59 by Michel Marcus at Sun Feb 14 02:36:39 EST 2021
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#58 by Michel Marcus at Sun Feb 14 02:36:32 EST 2021
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#57 by Michel Marcus at Sun Feb 14 02:36:29 EST 2021
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| LINKS
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H. Henry Bottomley, <a href="/A003215/a003215.gif">Illustration of initial terms</a>
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reviewed
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#56 by Joerg Arndt at Sun Feb 14 02:04:55 EST 2021
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#55 by Michel Marcus at Sun Feb 14 00:09:32 EST 2021
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#54 by Michel Marcus at Sun Feb 14 00:09:28 EST 2021
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