A172389 - OEIS

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A172389 as a simple table

n	a(n)
0	1
1	1
2	2
3	7
4	44
5	481
6	9272
7	310087
8	18164624
9	1843946881
10	326808099872
11	100310221406407
12	53656068398769344
13	49686835289802328801
14	80090696216400251499392
15	223445962168511596412895367

[1,1,2,7,44,481,9272,310087,18164624,1843946881, 326808099872,100310221406407,53656068398769344, 49686835289802328801,80090696216400251499392, 223445962168511596412895367]