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A131661 as a simple table

na(n)
10
20
32
45
514
622
744
868
9107
10172
11261
12396
13606
14950
151414
162238
173418
185411
198368
2013297
2120840
2233268
2352549
2484120
25133775
26214611
27343025
28551064
29883600
301421767
312284870
323680296
335924725
349551161
3515393855
3624834827
3740061700

[0,0,2,5,14,22,44,68,107,172,261,396,606,950,1414,
 2238,3418,5411,8368,13297,20840,33268,52549,84120,
 133775,214611,343025,551064,883600,1421767,
 2284870,3680296,5924725,9551161,15393855,24834827,
 40061700]