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A264497
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Number of permutations of [n] with exactly ten (possibly overlapping) occurrences of the generalized pattern 13-2.
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2
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74, 5343, 166144, 3342042, 51052432, 643569953, 7034981562, 68865924682, 617271459112, 5148104341380, 40431758240544, 301784671671496, 2156289904582398, 14834095711273034, 98718321568669660, 637965526671540768, 4016617646502383422, 24704067590177063445
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OFFSET
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8,1
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LINKS
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MAPLE
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b:= proc(u, o) option remember; `if`(u+o=0, 1, add(
b(u-j, o+j-1), j=1..u) +add(convert(series(
b(u+j-1, o-j)*x^(j-1), x, 11), polynom), j=1..o))
end:
a:= n-> coeff(b(n, 0), x, 10):
seq(a(n), n=8..25);
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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