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A317290
Number of permutations of [n] with exactly ten increasing runs of even length.
2
370371188237525, 38563334673062963, 2325983895636537462, 113126812608590106065, 4980791141860424686096, 206198935127851667065607, 8187758750644879282198684, 316873661623427502461383547, 12080329061828597152861716278, 456708256439969037699279918515
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OFFSET
20,1
LINKS
Alois P. Heinz,
Table of n, a(n) for n = 20..468
MAPLE
b:= proc(u, o, t) option remember; series(`if`(u+o=0, x^t,
add(b(u+j-1, o-j, irem(t+1, 2)), j=1..o)+
add(b(u-j, o+j-1, 0)*x^t, j=1..u)), x, 11)
end:
a:= n-> coeff(b(n, 0$2), x, 10):
seq(a(n), n=20..30);
CROSSREFS
Column k=10 of
A097592
.
Sequence in context:
A011528
A172542
A198803
*
A128769
A261150
A181392
Adjacent sequences:
A317287
A317288
A317289
*
A317291
A317292
A317293
KEYWORD
nonn
AUTHOR
Alois P. Heinz
, Jul 25 2018
STATUS
approved
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Last modified April 24 05:33 EDT 2024. Contains 371918 sequences. (Running on oeis4.)