A005261 - OEIS

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A005261 as a simple table

n	a(n)
0	1
1	2
2	34
3	488
4	9826
5	206252
6	4734304
7	113245568
8	2816649826
9	72001228052
10	1883210876284
11	50168588906768
12	1357245464138656
13	37198352117916992
14	1030920212982957184
15	28847760730478655488
16	814066783370083977826

[1,2,34,488,9826,206252,4734304,113245568, 2816649826,72001228052,1883210876284, 50168588906768,1357245464138656,37198352117916992, 1030920212982957184,28847760730478655488, 814066783370083977826]