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A013170 as a simple table

na(n)
01
12
24
311
440
5185
61030
76785
851160
9438425
104176250
1144098925
12507867100
136375156125
1486130937750
151253044612625
1619429666282000
17321457635604625
185626346310003250
19104323833636303125
202034312191276462500

[1,2,4,11,40,185,1030,6785,51160,438425,4176250,
 44098925,507867100,6375156125,86130937750,
 1253044612625,19429666282000,321457635604625,
 5626346310003250,104323833636303125,
 2034312191276462500]