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A000339 as a simple table

na(n)
21
35
418
545
6100
7185
8323
9522
10804
111180
121687
132322
143139
154146
165377
176859
188645
1910733
2013203
2116058
2219356
2323132
2427460
2532330
2637846
2744031
2850954
2958637
3067203
3176613
3287021
3398443
34110951
35124616
36139526
37155681
38173246
39192243

[1,5,18,45,100,185,323,522,804,1180,1687,2322,
 3139,4146,5377,6859,8645,10733,13203,16058,19356,
 23132,27460,32330,37846,44031,50954,58637,67203,
 76613,87021,98443,110951,124616,139526,155681,
 173246,192243]