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Revision History for A227819 (Underlined text is an addition; strikethrough text is a deletion.)

Showing entries 1-10 | older changes
A227819 Number T(n,k) of n-node rooted identity trees of height k; triangle T(n,k), n>=1, 0<=k<=n-1, read by rows.
(history; published version)
#34 by Alois P. Heinz at Fri Sep 07 22:08:22 EDT 2018
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#33 by Alois P. Heinz at Fri Sep 07 15:04:04 EDT 2018
EXAMPLE

1;

0, 1;

0, 0, 1;

0, 0, 1, 1;

0, 0, 0, 2, 1;

0, 0, 0, 2, 3, 1;

0, 0, 0, 2, 5, 4, 1;

0, 0, 0, 2, 8, 9, 5, 1;

0, 0, 0, 1, 12, 18, 14, 6, 1;

0, 0, 0, 1, 17, 34, 33, 20, 7, 1;

0, 0, 0, 1, 23, 61, 72, 54, 27, 8, 1;

0, 0, 0, 0, 32, 108, 149, 132, 82, 35, 9, 1;

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#32 by Alois P. Heinz at Fri Jul 11 21:56:28 EDT 2014
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#31 by Alois P. Heinz at Fri Jul 11 20:32:48 EDT 2014
CROSSREFS

T(2n,n) gives A245090.

T(2n+1,n) gives A245091.

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#30 by Alois P. Heinz at Sun Sep 22 10:26:53 EDT 2013
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#29 by Alois P. Heinz at Sun Sep 22 10:24:15 EDT 2013
CROSSREFS

Columns k=4-810 give: A038088, A038089, A038090, A038091, A038092, A229403, A229404.

#28 by Alois P. Heinz at Sun Sep 22 10:05:47 EDT 2013
CROSSREFS

Main diagonal and lower diagonals give (offsets may differ): A000012, A001477, A000096, A166830.

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#27 by Alois P. Heinz at Fri Aug 02 01:14:52 EDT 2013
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#26 by Alois P. Heinz at Fri Aug 02 01:13:26 EDT 2013
CROSSREFS

Largest n with T(n,k)>0 is A038093(k).

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#25 by Alois P. Heinz at Thu Aug 01 16:14:24 EDT 2013
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Last modified August 29 11:13 EDT 2024. Contains 375512 sequences. (Running on oeis4.)