A156778 - OEIS

A156778 as a simple table

n	a(n)
0	0
1	1
2	5
3	15
4	34
5	70
6	123
7	203
8	308
9	450
10	645
11	880
12	1182
13	1547
14	1967
15	2460
16	3048
17	3740
18	4509
19	5396
20	6390
21	7476
22	8701
23	10051
24	11556
25	13250
26	15093
27	17064
28	19194
29	21460
30	23895
31	26660
32	29616
33	32802
34	36159
35	39830
36	43686
37	47804
38	52193
39	56823
40	61740

[0,1,5,15,34,70,123,203,308,450,645,880,1182,1547, 1967,2460,3048,3740,4509,5396,6390,7476,8701, 10051,11556,13250,15093,17064,19194,21460,23895, 26660,29616,32802,36159,39830,43686,47804,52193, 56823,61740]