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A151357 as a simple table

n a(n)
0 1
1 0
2 1
3 3
4 4
5 20
6 65
7 175
8 742
9 2604
10 9072
11 36960
12 139392
13 538824
14 2198625
15 8735727
16 35456850
17 146812952
18 604215326
19 2521642266
20 10617725768
21 44760668160
22 190357768328
23 813800295880
24 3490232753680
25 15055389124320
26 65193213272800
27 283254330047520
28 1235731377864960
29 5407996483238160

[1,0,1,3,4,20,65,175,742,2604,9072,36960,139392,
 538824,2198625,8735727,35456850,146812952,
 604215326,2521642266,10617725768,44760668160,
 190357768328,813800295880,3490232753680,
 15055389124320,65193213272800,283254330047520,
 1235731377864960,5407996483238160]

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Last modified February 20 22:47 EST 2020. Contains 332086 sequences. (Running on oeis4.)