A203350 - OEIS

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A203350 as a simple table

n	a(n)
1	702
2	3716
3	17676
4	84322
5	403624
6	1933250
7	9252084
8	44314952
9	212152082
10	1015748354
11	4863391460
12	23285377744
13	111488661552
14	533799347054
15	2555788403334
16	12236920029664
17	58589438107390
18	280521733711996

[702,3716,17676,84322,403624,1933250,9252084, 44314952,212152082,1015748354,4863391460, 23285377744,111488661552,533799347054, 2555788403334,12236920029664,58589438107390, 280521733711996]