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A020540 as a simple table

na(n)
04
156
2496
34064
432704
5262016
62096896
716776704
8134216704
91073739776
108589930496
1168719468544
12549755797504
134398046478336
1435184372023296
15281474976579584
162251799813423104
1718014398508957696
18144115188074807296

[4,56,496,4064,32704,262016,2096896,16776704,
 134216704,1073739776,8589930496,68719468544,
 549755797504,4398046478336,35184372023296,
 281474976579584,2251799813423104,
 18014398508957696,144115188074807296]