A217000 - OEIS

A217000 as a simple table

n	a(n)
1	3
2	21
3	45
4	105
5	253
6	325
7	465
8	561
9	861
10	1081
11	1225
12	1485
13	1653
14	1953
15	3741
16	4005
17	4753
18	6441
19	7021
20	7381
21	8001
22	9045
23	10153
24	13041
25	15753
26	19701
27	20301
28	21945
29	23005
30	23653
31	24753
32	25425
33	28441
34	32385
35	35245
36	37401
37	38781
38	41041
39	43365
40	45753
41	46665
42	48205

[3,21,45,105,253,325,465,561,861,1081,1225,1485, 1653,1953,3741,4005,4753,6441,7021,7381,8001,9045, 10153,13041,15753,19701,20301,21945,23005,23653, 24753,25425,28441,32385,35245,37401,38781,41041, 43365,45753,46665,48205]