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A320737 Number of partitions of n with six sorts of part 1 which are introduced in ascending order. 4

%I #8 Dec 07 2020 09:03:27

%S 1,1,3,7,20,63,233,965,4425,21904,114910,628754,3544272,20393306,

%T 118986963,700768255,4152987416,24714368292,147480695339,881688073414,

%U 5277421580515,31613933962624,189481916086717,1136086826214117,6813308511956936,40867019987219945

%N Number of partitions of n with six sorts of part 1 which are introduced in ascending order.

%H Alois P. Heinz, <a href="/A320737/b320737.txt">Table of n, a(n) for n = 0..1288</a>

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

%p Stirling2(n, j), j=0..6), add(b(n-i*j, i-1), j=0..n/i))

%p end:

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

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

%t b[n_, i_] := b[n, i] = If[n == 0 || i < 2, Sum[StirlingS2[n, j], {j, 0, 6}], Sum[b[n - i j, i - 1], {j, 0, n/i}]];

%t a[n_] := b[n, n];

%t a /@ Range[0, 40] (* _Jean-Fran├žois Alcover_, Dec 07 2020, after _Alois P. Heinz_ *)

%Y Column k=6 of A292745.

%K nonn

%O 0,3

%A _Alois P. Heinz_, Oct 20 2018

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Last modified June 8 18:04 EDT 2023. Contains 363165 sequences. (Running on oeis4.)