A096817 - OEIS

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A096817 as a simple table

n	a(n)
1	4
2	6
3	10
4	18
5	42
6	78
7	94
8	114
9	190
10	322
11	546
12	3894
13	10318
14	11650
15	12474
16	20994
17	61810
18	103882
19	296010
20	636930
21	653638
22	926766

[4,6,10,18,42,78,94,114,190,322,546,3894,10318, 11650,12474,20994,61810,103882,296010,636930, 653638,926766]