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A259399 as a simple table

na(n)
01
12
26
315
440
589
6210
7435
8919
91819
103583
116719
1212648
1322849
1441074
1572050
16125411
17213620
18361845
19601945
20995074
211622338
222626342
234201367
246681992
2510515756
2616449852
2725509952
2839333476
2960172701
3091577517
31138390481
32208096282
33310976731
34462512831

[1,2,6,15,40,89,210,435,919,1819,3583,6719,12648,
 22849,41074,72050,125411,213620,361845,601945,
 995074,1622338,2626342,4201367,6681992,10515756,
 16449852,25509952,39333476,60172701,91577517,
 138390481,208096282,310976731,462512831]