A217381 - OEIS

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A217381 as a simple table

n	a(n)
1	2
2	6
3	10
4	26
5	42
6	58
7	68
8	196
9	266
10	602
11	1170
12	1288
13	1290
14	2990
15	4110
16	6292
17	7446
18	36928
19	57490
20	65478
21	78570
22	188832

[2,6,10,26,42,58,68,196,266,602,1170,1288,1290, 2990,4110,6292,7446,36928,57490,65478,78570, 188832]