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A005977 as a simple table

na(n)
10
20
30
40
51
62
77
831
9168
101025
117013
1252495
13425213
143696032
1534291937
16338161526
173532185118
1838963334652
19452704892533
205526901638291
2170746674291507

[0,0,0,0,1,2,7,31,168,1025,7013,52495,425213,
 3696032,34291937,338161526,3532185118,38963334652,
 452704892533,5526901638291,70746674291507]