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A277652 as a simple table

n a(n)
0 0
1 0
2 4
3 40
4 312
5 2212
6 14920
7 97632
8 626080
9 3957448
10 24747948
11 153483720
12 945638232
13 5795135820
14 35357242128
15 214919392128
16 1302250826880
17 7869116134672
18 47437683195220
19 285373276253352
20 1713562776624952
21 10272384482513140
22 61489533128765784
23 367581030765071200

[0,0,4,40,312,2212,14920,97632,626080,3957448,
 24747948,153483720,945638232,5795135820,
 35357242128,214919392128,1302250826880,
 7869116134672,47437683195220,285373276253352,
 1713562776624952,10272384482513140,
 61489533128765784,367581030765071200]

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Last modified November 17 13:33 EST 2019. Contains 329230 sequences. (Running on oeis4.)