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A061640 as a simple table

na(n)
00
11
24
324
4240
54080
6110880
74404960
8238452480
916777393920
101484592883200
11161180605555200
1221054378333542400
133256459844769331200
14588451470437627596800
15122827588904844375552000

[0,1,4,24,240,4080,110880,4404960,238452480,
 16777393920,1484592883200,161180605555200,
 21054378333542400,3256459844769331200,
 588451470437627596800,122827588904844375552000]