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A373963 as a simple table

na(n)
10
20
31
44
510
620
735
857
994
10175
11385
12935
132289
145385
1512031
1625686
1753176
18108699
19223215
20465867
21991088
222138884
234643816
2410067197
2521695156
2646427790
2798807200
28209689343
29444983081
30946084386
312016738335
324308708305
339217134511
3419720875625

[0,0,1,4,10,20,35,57,94,175,385,935,2289,5385,
 12031,25686,53176,108699,223215,465867,991088,
 2138884,4643816,10067197,21695156,46427790,
 98807200,209689343,444983081,946084386,2016738335,
 4308708305,9217134511,19720875625]