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A028468 as a simple table

na(n)
01
11
213
341
4281
51183
66728
731529
8167089
9817991
104213133
1121001799
12106912793
13536948224
142720246633
1513704300553
1669289288909
17349519610713
181765722581057
198911652846951
2045005025662792
21227191499132401
221147185247901449
235791672851807479

[1,1,13,41,281,1183,6728,31529,167089,817991,
 4213133,21001799,106912793,536948224,2720246633,
 13704300553,69289288909,349519610713,
 1765722581057,8911652846951,45005025662792,
 227191499132401,1147185247901449,5791672851807479]