The On-Line Encyclopedia of Integer Sequences (OEIS)

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A026150

a(0) = a(1) = 1; a(n+2) = 2*a(n+1) + 2*a(n).
(history; published version)

#152 by Charles R Greathouse IV at Thu Sep 08 08:44:49 EDT 2022

PROG

(MAGMAMagma) [n le 2 select 1 else 2*Self(n-1) + 2*Self(n-2): n in [1..30]]; // G. C. Greubel, Jan 07 2018

Discussion

Thu Sep 08

08:44

OEIS Server: https://oeis.org/edit/global/2944

#151 by Michael De Vlieger at Sat Aug 20 13:39:52 EDT 2022

STATUS

proposed

approved

#150 by Michel Marcus at Sat Aug 20 13:19:19 EDT 2022

STATUS

editing

proposed

#149 by Michel Marcus at Sat Aug 20 13:19:15 EDT 2022

COMMENTS

Number of 3-permutations of n elements avoiding the patterns 231, 312. See Bonichon and Sun. - Michel Marcus, Aug 19 2022

STATUS

approved

editing

#148 by Michael De Vlieger at Fri Aug 19 13:53:53 EDT 2022

STATUS

proposed

approved

#147 by Michel Marcus at Fri Aug 19 10:09:25 EDT 2022

STATUS

editing

proposed

#146 by Michel Marcus at Fri Aug 19 10:09:21 EDT 2022

COMMENTS

Number of 3-permutations avoiding the patterns 231, 312. See Bonichon and Sun. - Michel Marcus, Aug 19 2022

#145 by Michel Marcus at Fri Aug 19 02:46:24 EDT 2022

LINKS

<a href="/index/Ch#Cheby">Index entries for sequences related to Chebyshev polynomial.polynomials</a>.

#144 by Michel Marcus at Fri Aug 19 02:05:18 EDT 2022

LINKS

Nicolas Bonichon and Pierre-Jean Morel, <a href="https://arxiv.org/abs/2202.12677">Baxter d-permutations and other pattern avoiding classes</a>, arXiv:2202.12677 [math.CO], 2022.

Nathan Sun, <a href="https://arxiv.org/abs/2208.08506">On d-permutations and Pattern Avoidance Classes</a>, arXiv:2208.08506 [math.CO], 2022.

<a href="/index/Ch#Cheby">Index entries for sequences related to Chebyshev polynomialspolynomial.</a>.

STATUS

approved

editing

#143 by Peter Luschny at Wed Feb 26 04:12:12 EST 2020

STATUS

proposed

approved