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A233982 as a simple table

na(n)
156
2236
3976
44064
516880
670176
7291648
81212224
95038336
1020941056
1187037696
12361757184
131503580160
146249368576
1525974407168
16107958083584
17448708898816
181864980094976
197751463714816
2032217603784704
21133906837667840

[56,236,976,4064,16880,70176,291648,1212224,
 5038336,20941056,87037696,361757184,1503580160,
 6249368576,25974407168,107958083584,448708898816,
 1864980094976,7751463714816,32217603784704,
 133906837667840]