A077045 - cp's OEIS frontend

A077045 Doubly restricted composition numbers: number of compositions of 1+2+3+...+n = n(n+1)/2 into exactly n positive integers each no more than n.

n	a(n)
0	1
1	1
2	2
3	7
4	44
5	381
6	4332
7	60691
8	1012664
9	19610233
10	432457640
11	10701243741
12	293661065788
13	8851373201919
14	290711372717976
15	10334165623697259
16	395320344293410544
17	16192709833199300337
18	707125993042984343136
19	32795665902734099555845
20	1609908874238209683872480

[1, 1, 2, 7, 44, 381, 4332, 60691, 1012664, 19610233, 432457640, 10701243741, 293661065788, 8851373201919, 290711372717976, 10334165623697259, 395320344293410544, 16192709833199300337, 707125993042984343136, 32795665902734099555845, 1609908874238209683872480]

cp's OEIS Frontend

A077045 Doubly restricted composition numbers: number of compositions of 1+2+3+...+n = n(n+1)/2 into exactly n positive integers each no more than n.

Table of values

List of values