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A006904 as a simple table

na(n)
41
51
64
75
814
923
1052
1197
12202
13395
14800
151589
163190
176367
1812748
1925481
2050978
21101939
22203896
23407773
24815566
251631111
263262244
276524465
2813048954
2926097883
3052195792
31104391557

[1,1,4,5,14,23,52,97,202,395,800,1589,3190,6367,
 12748,25481,50978,101939,203896,407773,815566,
 1631111,3262244,6524465,13048954,26097883,
 52195792,104391557]