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A115864 as a simple table

na(n)
01
18
288
31088
414176
5190208
62600704
736030464
8504047104
97104278528
10100726755328
111435037302784
1220526579564544
13294599134674944
144240277467168768
1561183611081064448
16884741809748967424

[1,8,88,1088,14176,190208,2600704,36030464,
 504047104,7104278528,100726755328,1435037302784,
 20526579564544,294599134674944,4240277467168768,
 61183611081064448,884741809748967424]