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A323972 as a simple table

n a(n)
0 1
1 21
2 259
3 2570
4 18546
5 106067
6 508484
7 2117690
8 7852836
9 26400811
10 81594028
11 234380304
12 631352789
13 1606571023
14 3885713191
15 8979237218
16 19912769178
17 42540796862
18 87841523926
19 175820917355
20 341996038445
21 647926774508
22 1197980968295
23 2165529201795
24 3833173915877

[1,21,259,2570,18546,106067,508484,2117690,
 7852836,26400811,81594028,234380304,631352789,
 1606571023,3885713191,8979237218,19912769178,
 42540796862,87841523926,175820917355,341996038445,
 647926774508,1197980968295,2165529201795,
 3833173915877]

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Last modified May 25 02:47 EDT 2019. Contains 323539 sequences. (Running on oeis4.)