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A231896 as a simple table

na(n)
00
14
216
360
4224
5836
63120
711644
843456
9162180
10605264
112258876
128430240
1331462084
14117418096
15438210300
161635423104
176103482116
1822778505360
1985010539324
20317263651936
211184044068420
224418912621744
2316491606418556
2461547513052480
25229698445791364

[0,4,16,60,224,836,3120,11644,43456,162180,605264,
 2258876,8430240,31462084,117418096,438210300,
 1635423104,6103482116,22778505360,85010539324,
 317263651936,1184044068420,4418912621744,
 16491606418556,61547513052480,229698445791364]