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A026031 as a simple table

na(n)
21
36
428
5120
6494
71988
87888
931008
10121125
11471086
121826660
137068360
1427313650
15105452700
16406923360
171569869760
186056194410
1923366193084
2090173331960
21348102883184
221344324544156
235193831553416
2420075820280544
2577637309982400

[1,6,28,120,494,1988,7888,31008,121125,471086,
 1826660,7068360,27313650,105452700,406923360,
 1569869760,6056194410,23366193084,90173331960,
 348102883184,1344324544156,5193831553416,
 20075820280544,77637309982400]