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A277876 as a simple table

na(n)
22
33
46
520
680
7420
82520
918144
10145152
111330560
1213305600
13148262400
141779148800
1523351328000
16326918592000
174940103168000
1879041650688000
191351612226764800
2024329020081766400
21464463110651904000
229289262213038080000
23195848611658219520000

[2,3,6,20,80,420,2520,18144,145152,1330560,
 13305600,148262400,1779148800,23351328000,
 326918592000,4940103168000,79041650688000,
 1351612226764800,24329020081766400,
 464463110651904000,9289262213038080000,
 195848611658219520000]