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A320733 Number of partitions of n with two sorts of part 1 which are introduced in ascending order. 3
1, 1, 3, 6, 13, 26, 54, 108, 219, 439, 882, 1766, 3539, 7081, 14172, 28351, 56716, 113443, 226908, 453833, 907698, 1815424, 3630893, 7261829, 14523725, 29047513, 58095121, 116190338, 232380810, 464761759, 929523710, 1859047619, 3718095507, 7436191301 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..3322

MAPLE

b:= proc(n, i) option remember; `if`(n=0 or i<2, add(

      Stirling2(n, j), j=0..2), add(b(n-i*j, i-1), j=0..n/i))

    end:

a:= n-> b(n$2):

seq(a(n), n=0..40);

CROSSREFS

Column k=2 of A292745.

Sequence in context: A081254 A125049 A267581 * A164991 A213255 A215985

Adjacent sequences:  A320730 A320731 A320732 * A320734 A320735 A320736

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Oct 20 2018

STATUS

approved

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Last modified October 16 16:08 EDT 2019. Contains 328101 sequences. (Running on oeis4.)