A077690 - OEIS

A077690 as a simple table

n	a(n)
1	1
2	21
3	3
4	45
5	55
6	6
7	78
8	820
9	91
10	10
11	28
12	36
13	406
14	528
15	66
16	703
17	861
18	903
19	15
20	210
21	300
22	435
23	561
24	630
25	741
26	8001
27	946
28	105
29	231
30	325
31	465
32	595
33	666
34	780
35	8128
36	990
37	120
38	253
39	351
40	496
41	5050
42	6105
43	7021
44	8256
45	9045

[1,21,3,45,55,6,78,820,91,10,28,36,406,528,66,703, 861,903,15,210,300,435,561,630,741,8001,946,105, 231,325,465,595,666,780,8128,990,120,253,351,496, 5050,6105,7021,8256,9045]