A012137 - OEIS

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A012137 as a simple table

n	a(n)
0	1
1	1
2	17
3	673
4	54305
5	7334273
6	1497501873
7	430436005665
8	165573876222529
9	82074493484054017
10	50922938856050558289
11	38644611846710150572193
12	35205379514991276523808353
13	37909794281251146499011279233

[1,1,17,673,54305,7334273,1497501873,430436005665, 165573876222529,82074493484054017, 50922938856050558289,38644611846710150572193, 35205379514991276523808353, 37909794281251146499011279233]