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A263891
Number of permutations of [n] containing exactly seven occurrences of the consecutive pattern 132.
2
135135, 76769280, 10623587400, 869421477888, 53506915544340, 2760751748210688, 126815221020754440, 5382400437244477440, 216344464203055466790, 8377766827724961054720, 316434243063274830653400, 11764325342293663024742400, 433465553417224967969040900
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OFFSET
15,1
LINKS
Alois P. Heinz,
Table of n, a(n) for n = 15..100
FORMULA
a(n) =
A197365
(n,7).
MAPLE
b:= proc(u, o, t) option remember; series(`if`(u+o=0, 1,
add(b(u-j, o+j-1, 0)*`if`(j<=t, x, 1), j=1..u)+
add(b(u+j-1, o-j, j-1), j=1..o)), x, 8)
end:
a:= n-> coeff(b(n, 0$2), x, 7):
seq(a(n), n=15..35);
CROSSREFS
Column k=7 of
A197365
.
Sequence in context:
A104440
A290036
A289955
*
A360662
A235209
A183734
Adjacent sequences:
A263888
A263889
A263890
*
A263892
A263893
A263894
KEYWORD
nonn
AUTHOR
Alois P. Heinz
, Oct 28 2015
STATUS
approved
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Last modified September 14 21:48 EDT 2024. Contains 375929 sequences. (Running on oeis4.)