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A272261 as a simple table

na(n)
01
10
24
340
4576
510528
6233920
76124032
8184656640
96302821888
10240245858304
1110115537336320
12466275700903936
1323354247194542080
141262994451308888064
1573347095164693676032
164552571878016243466240
17300763132329730843475968
1821071629550593224017182720

[1,0,4,40,576,10528,233920,6124032,184656640,
 6302821888,240245858304,10115537336320,
 466275700903936,23354247194542080,
 1262994451308888064,73347095164693676032,
 4552571878016243466240,300763132329730843475968,
 21071629550593224017182720]