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A091266 as a simple table

na(n)
10
20
312
4216
53500
658494
71028167
818954072
9363991752
107231521650
11147777013109
123091874792274
1365993049570175
141432803420182428
1531570847522072400
16704668366087255200
1715907964778448807820

[0,0,12,216,3500,58494,1028167,18954072,363991752,
 7231521650,147777013109,3091874792274,
 65993049570175,1432803420182428,31570847522072400,
 704668366087255200,15907964778448807820]