A023950 - OEIS

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A023950 as a simple table

n	a(n)
0	1
1	23
2	348
3	4378
4	49679
5	528381
6	5380306
7	53132816
8	513181317
9	4875626899
10	45752166824
11	425305531014
12	3925114125115
13	36023250380777
14	329183853207102
15	2998041099306172
16	27233460168740273
17	246879085434889215

[1,23,348,4378,49679,528381,5380306,53132816, 513181317,4875626899,45752166824,425305531014, 3925114125115,36023250380777,329183853207102, 2998041099306172,27233460168740273, 246879085434889215]