A364417 - OEIS

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A364417 as a simple table

n	a(n)
3	3
4	18
5	142
6	1266
7	12030
8	118650
9	1198230
10	12296202
11	127633590
12	1336133730
13	14079114270
14	149124688482
15	1586159072814
16	16929780310218
17	181227223899942
18	1944808008842490
19	20915277691567206

[3,18,142,1266,12030,118650,1198230,12296202, 127633590,1336133730,14079114270,149124688482, 1586159072814,16929780310218,181227223899942, 1944808008842490,20915277691567206]