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A355515 as a simple table

na(n)
12
25
318
431
5137
6928
71719
842047
982375
10287453
11779984
121272515
131765046
142257577
152750108
163242639
173735170
184227701
194720232
205212763
215705294
226197825
236690356
247182887
257675418
268167949
278660480
289153011
299645542
3010138073
3110630604
3211123135
3311615666
3412108197

[2,5,18,31,137,928,1719,42047,82375,287453,779984,
 1272515,1765046,2257577,2750108,3242639,3735170,
 4227701,4720232,5212763,5705294,6197825,6690356,
 7182887,7675418,8167949,8660480,9153011,9645542,
 10138073,10630604,11123135,11615666,12108197]