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A056298 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 1
6 3
7 20
8 136
9 773
10 4281
11 22430
12 115100
13 577577
14 2863227
15 14051164
16 68515514
17 332514803
18 1608800691
19 7767857090
20 37460388596
21 180536313547
22 869901397479
23 4192038616700
24 20208367895980

[0,0,0,0,1,3,20,136,773,4281,22430,115100,577577,
 2863227,14051164,68515514,332514803,1608800691,
 7767857090,37460388596,180536313547,869901397479,
 4192038616700,20208367895980]

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Last modified April 9 20:55 EDT 2020. Contains 333363 sequences. (Running on oeis4.)