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A274997 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 6
5 41
6 274
7 2040
8 16346
9 143571
10 1365354
11 14056287
12 155638724
13 1847352720
14 23400880036
15 315270938501
16 4502081195166
17 67941159822229
18 1080528172834710
19 18065046986905320
20 316769071197428286
21 5813469963339136855
22 111449225620923739458

[0,0,0,1,6,41,274,2040,16346,143571,1365354,
 14056287,155638724,1847352720,23400880036,
 315270938501,4502081195166,67941159822229,
 1080528172834710,18065046986905320,
 316769071197428286,5813469963339136855,
 111449225620923739458]

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Last modified February 3 18:43 EST 2023. Contains 360044 sequences. (Running on oeis4.)