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A304701 as a simple table

na(n)
13
251
346
4215
5908
65232
719701
8135455
9872954
104460213
1128861276
12182319313
131043954782
146559780616
1540608072614
16242771829978
171502847915709
189234685790042
1956064025371157
20344833181614977
212113754951173744

[3,51,46,215,908,5232,19701,135455,872954,4460213,
 28861276,182319313,1043954782,6559780616,
 40608072614,242771829978,1502847915709,
 9234685790042,56064025371157,344833181614977,
 2113754951173744]