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A219972 as a simple table

n a(n)
0 1
1 0
2 4
3 19
4 70
5 456
6 2530
7 12343
8 66653
9 372429
10 1910822
11 10162059
12 55583124
13 291195073
14 1550518247
15 8363883923
16 44269140576
17 235940940726
18 1264437357202
19 6723179849519
20 35846240541026
21 191571690239220
22 1020536749613565
23 5442225134864810
24 29051213879574079

[1,0,4,19,70,456,2530,12343,66653,372429,1910822,
 10162059,55583124,291195073,1550518247,8363883923,
 44269140576,235940940726,1264437357202,
 6723179849519,35846240541026,191571690239220,
 1020536749613565,5442225134864810,
 29051213879574079]

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Last modified August 15 16:57 EDT 2022. Contains 356148 sequences. (Running on oeis4.)