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A073991 as a simple table

na(n)
10
24
318
448
5180
61080
77056
844928
9286416
101762560
1110349856
1260217344
13356638464
142145709440
1512976433280
1678399995904
17472093588224
182832561529344
1916960580969472
20101554796888064
21608733733690368
223652526115938304
2321926115464435712
24131620960833896448

[0,4,18,48,180,1080,7056,44928,286416,1762560,
 10349856,60217344,356638464,2145709440,
 12976433280,78399995904,472093588224,
 2832561529344,16960580969472,101554796888064,
 608733733690368,3652526115938304,
 21926115464435712,131620960833896448]