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A263002 as a simple table

na(n)
01
12
25
310
420
534
661
7100
8165
9260
10408
11620
12940
131390
142045
152960
164257
176040
188525
1911900
2016522
2122738
2231130
2342300
2457210
2576872
26102834
27136800
28181230
29238900
30313725
31410160
32534330
33693330
34896655
351155420
361484274
371900420
382426215
393088100

[1,2,5,10,20,34,61,100,165,260,408,620,940,1390,
 2045,2960,4257,6040,8525,11900,16522,22738,31130,
 42300,57210,76872,102834,136800,181230,238900,
 313725,410160,534330,693330,896655,1155420,
 1484274,1900420,2426215,3088100]