A246791 - OEIS

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A246791 as a simple table

n	a(n)
1	1
2	4
3	15
4	136
5	2128
6	15453
7	479403
8	1184231
9	10975072
10	27112368
11	175600366
12	2304656281
13	14896902677
14	59331462112

[1,4,15,136,2128,15453,479403,1184231,10975072, 27112368,175600366,2304656281,14896902677, 59331462112]