A156907 - OEIS

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A156907 as a simple table

n	a(n)
0	1
1	1
2	2
3	18
4	476
5	38358
6	11363548
7	15060027956
8	92500603618872
9	2483766272252845670
10	279689176516909339664044
11	129570236404446129260308225372
12	244562582019257683819447274838128648

[1,1,2,18,476,38358,11363548,15060027956, 92500603618872,2483766272252845670, 279689176516909339664044, 129570236404446129260308225372, 244562582019257683819447274838128648]