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A066536 as a simple table

na(n)
01
14
212
332
490
5312
61288
75504
822608
988660
10339064
111297056
125043376
1319975256
1480027280
15321692928
161291650786
175177295432
1820748447108
1983279292960
20335056780464
211351064867328
225456890474248
2322063059606912

[1,4,12,32,90,312,1288,5504,22608,88660,339064,
 1297056,5043376,19975256,80027280,321692928,
 1291650786,5177295432,20748447108,83279292960,
 335056780464,1351064867328,5456890474248,
 22063059606912]