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A090228 as a simple table

n a(n)
0 0
1 1
2 8
3 168
4 714
5 1870
6 7920
7 54288
8 229970
9 602070
10 2550408
11 10803704
12 28284465
13 74049690
14 193864606
15 821223648
16 3478759200
17 9107509825
18 23843770274
19 62423800998
20 264431464440
21 1120149658760
22 2932589879121
23 7677619978602

[0,1,8,168,714,1870,7920,54288,229970,602070,
 2550408,10803704,28284465,74049690,193864606,
 821223648,3478759200,9107509825,23843770274,
 62423800998,264431464440,1120149658760,
 2932589879121,7677619978602]

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Last modified October 16 19:13 EDT 2021. Contains 348043 sequences. (Running on oeis4.)