A197976 - OEIS

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A197976 as a simple table

n	a(n)
1	4
2	42
3	813
4	22519
5	811368
6	35946076
7	1888624972
8	114746269758
9	7912720985079
10	610470884770406
11	52094956940751710
12	4871691779130290166
13	495409898474358881327
14	54427906182810588386674
15	6424384909407981686846705

[4,42,813,22519,811368,35946076,1888624972, 114746269758,7912720985079,610470884770406, 52094956940751710,4871691779130290166, 495409898474358881327,54427906182810588386674, 6424384909407981686846705]