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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 (list; graph; refs; listen; history; text; internal format)
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 May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)