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A056464 as a simple table

na(n)
10
20
30
40
56
66
736
836
9150
10144
11540
12534
131806
141770
155790
165760
1718150
1817994
1955980
2055830
21170970
22170466
23519156
24518580
251569744
261567944
274733670
284732014
2914250606
3014244660
3142850116
3242844320
33128746410
34128728800

[0,0,0,0,6,6,36,36,150,144,540,534,1806,1770,5790,
 5760,18150,17994,55980,55830,170970,170466,519156,
 518580,1569744,1567944,4733670,4732014,14250606,
 14244660,42850116,42844320,128746410,128728800]