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A109020 as a simple table

n a(n)
0 0
1 1
2 12
3 101
4 760
5 5481
6 38852
7 273421
8 1918320
9 13441361
10 94128892
11 659020341
12 4613496680
13 32295539641
14 226071966132
15 1582513328861
16 11077621999840
17 77543440092321
18 542804338926572
19 3799631147326981
20 26597420355811800
21 186181949464251401
22 1303273667170466212

[0,1,12,101,760,5481,38852,273421,1918320,
 13441361,94128892,659020341,4613496680,
 32295539641,226071966132,1582513328861,
 11077621999840,77543440092321,542804338926572,
 3799631147326981,26597420355811800,
 186181949464251401,1303273667170466212]

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Last modified September 20 22:02 EDT 2021. Contains 347591 sequences. (Running on oeis4.)