A111557 - OEIS

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A111557 as a simple table

n	a(n)
0	1
1	5
2	34
3	282
4	2696
5	28792
6	337072
7	4273632
8	58195072
9	846038912
10	13072140032
11	213897731712
12	3695682017792
13	67254929193472
14	1286282280266752
15	25802708552696832
16	541894309127053312
17	11894387852938452992

[1,5,34,282,2696,28792,337072,4273632,58195072, 846038912,13072140032,213897731712,3695682017792, 67254929193472,1286282280266752,25802708552696832, 541894309127053312,11894387852938452992]