A111555 - OEIS

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A111555 as a simple table

n	a(n)
0	1
1	3
2	16
3	116
4	1016
5	10176
6	113216
7	1375456
8	18047296
9	253815936
10	3805221376
11	60558070016
12	1019617312256
13	18111737604096
14	338602832961536
15	6648048064792576
16	136810876329865216
17	2945671077411987456

[1,3,16,116,1016,10176,113216,1375456,18047296, 253815936,3805221376,60558070016,1019617312256, 18111737604096,338602832961536,6648048064792576, 136810876329865216,2945671077411987456]