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A265664 as a simple table

na(n)
12
20
34
416
560
6228
71024
84288
918172
1076838
11326264
121390048
135947760
1425515274
15109801760
16473895774
172050771696
188896415264
1938680996104
20168532976250
21735715851956
223217440736916
2314093823129980
2461831989407076

[2,0,4,16,60,228,1024,4288,18172,76838,326264,
 1390048,5947760,25515274,109801760,473895774,
 2050771696,8896415264,38680996104,168532976250,
 735715851956,3217440736916,14093823129980,
 61831989407076]