A237385 - OEIS

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A237385 as a simple table

n	a(n)
1	81
2	434
3	2336
4	12624
5	68064
6	366568
7	1976940
8	10657560
9	57441532
10	309578264
11	1668794652
12	8995139000
13	48484851148
14	261335232440
15	1408647749404
16	7592807398296
17	40926289471308
18	220597727495896
19	1189054017281884

[81,434,2336,12624,68064,366568,1976940,10657560, 57441532,309578264,1668794652,8995139000, 48484851148,261335232440,1408647749404, 7592807398296,40926289471308,220597727495896, 1189054017281884]