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A056509 as a simple table

na(n)
10
20
30
41
51
65
76
819
925
1064
1190
12208
13301
14656
15966
162035
173025
186250
199330
2019035
2128501
2257740
2386526
24174436
25261625
26525994
27788970
281583119
292375101
304760516
317141686
3214303011
3321457825
3442954850
3564439010
36128953341
37193448101
38387046700
39580606446
401161504423

[0,0,0,1,1,5,6,19,25,64,90,208,301,656,966,2035,
 3025,6250,9330,19035,28501,57740,86526,174436,
 261625,525994,788970,1583119,2375101,4760516,
 7141686,14303011,21457825,42954850,64439010,
 128953341,193448101,387046700,580606446,
 1161504423]