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A056268 as a simple table

na(n)
10
20
36
436
5150
6534
71806
85760
918144
1055830
11171006
12518580
131569750
144732014
1514250450
1642844320
17128746950
18386615376
191160688606
203483582660
2110454059938
2231368305694
2394118013006
24282378679920
25847187946000
262541662931990
277625194813656
2822875982414740

[0,0,6,36,150,534,1806,5760,18144,55830,171006,
 518580,1569750,4732014,14250450,42844320,
 128746950,386615376,1160688606,3483582660,
 10454059938,31368305694,94118013006,282378679920,
 847187946000,2541662931990,7625194813656,
 22875982414740]