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A124806 as a simple table

na(n)
01
15
219
365
4247
5955
63733
714649
857583
9226505
10891219
113507047
1213801285
1354313277
14213745019
15841177105
163310392415
1713027820227
1851270096661
19201769982673
20794052091767
213124938240153
2212297982928987
2348397879544975

[1,5,19,65,247,955,3733,14649,57583,226505,891219,
 3507047,13801285,54313277,213745019,841177105,
 3310392415,13027820227,51270096661,201769982673,
 794052091767,3124938240153,12297982928987,
 48397879544975]