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A258477 Number of partitions of n into two sorts of parts having exactly 7 parts of the second sort. 2
1, 9, 46, 175, 551, 1517, 3775, 8677, 18702, 38221, 74670, 140380, 255200, 450587, 775050, 1302820, 2144491, 3464614, 5501502, 8601609, 13254960, 20160072, 30285308, 44987881, 66117110, 96226698, 138744972, 198343467, 281212898, 395689440, 552693604, 766773242 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 7..1000

MAPLE

b:= proc(n, i) option remember; series(`if`(n=0, 1,

      `if`(i<1, 0, add(b(n-i*j, i-1)*add(x^t*

       binomial(j, t), t=0..min(7, j)), j=0..n/i))), x, 8)

    end:

a:= n-> coeff(b(n$2), x, 7):

seq(a(n), n=7..40);

CROSSREFS

Column k=7 of A256193.

Sequence in context: A061620 A260513 A001781 * A320755 A053308 A201458

Adjacent sequences:  A258474 A258475 A258476 * A258478 A258479 A258480

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 31 2015

STATUS

approved

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Last modified October 18 03:25 EDT 2021. Contains 348065 sequences. (Running on oeis4.)