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A227438 as a simple table

na(n)
14
216
362
4240
5932
63620
714056
854576
9211912
10822832
113194960
1212405648
1348169664
14187037120
15726243040
162819915904
1710949400256
1842515227456
19165081604736
20640992365568
212488897617536
229664095367424
2337524540428032

[4,16,62,240,932,3620,14056,54576,211912,822832,
 3194960,12405648,48169664,187037120,726243040,
 2819915904,10949400256,42515227456,165081604736,
 640992365568,2488897617536,9664095367424,
 37524540428032]