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A228851 as a simple table

na(n)
15
223
3157
4839
53449
65939
713417
873951
9453991
10500471
116949309
128282063
1326332367
1430345169
15259778821
16272282191
17438571597
18859046141
191037917517
203321660649
21398296179
2212252989773

[5,23,157,839,3449,5939,13417,73951,453991,500471,
 6949309,8282063,26332367,30345169,259778821,
 272282191,438571597,859046141,1037917517,
 3321660649,398296179,12252989773]