A236604 - OEIS

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A236604 as a simple table

n	a(n)
1	81
2	426
3	2269
4	12004
5	63945
6	339684
7	1806104
8	9590924
9	50981860
10	270885808
11	1439698020
12	7649649584
13	40652677572
14	216021080080
15	1147974683632
16	6100208729024
17	32416974402064
18	172262578560928
19	915411064116880

[81,426,2269,12004,63945,339684,1806104,9590924, 50981860,270885808,1439698020,7649649584, 40652677572,216021080080,1147974683632, 6100208729024,32416974402064,172262578560928, 915411064116880]