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A274873 as a simple table

n a(n)
9 1
10 4
11 70
12 280
13 2919
14 11676
15 94944
16 379776
17 2669361
18 10677444
19 68321994
20 273287976
21 1640345707
22 6561382828
23 37643205652
24 150572822608
25 836008721925
26 3344034887700
27 18122573826942
28 72490295307768
29 385781480224959
30 1543125920899836
31 8099850233307144

[1,4,70,280,2919,11676,94944,379776,2669361,
 10677444,68321994,273287976,1640345707,6561382828,
 37643205652,150572822608,836008721925,
 3344034887700,18122573826942,72490295307768,
 385781480224959,1543125920899836,8099850233307144]

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Last modified January 24 13:48 EST 2022. Contains 350538 sequences. (Running on oeis4.)