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A149917 as a simple table

na(n)
01
12
25
315
447
5155
6545
71982
87366
928040
10108465
11425789
121698808
136859370
1427955680
15114943633
16476154065
171986712591
188348735338
1935294521877
20149972186973
21640252876498
222745195496472
2311820325855569
2451102650867725
25221726509972662
26965121780389572
274213436370834023

[1,2,5,15,47,155,545,1982,7366,28040,108465,
 425789,1698808,6859370,27955680,114943633,
 476154065,1986712591,8348735338,35294521877,
 149972186973,640252876498,2745195496472,
 11820325855569,51102650867725,221726509972662,
 965121780389572,4213436370834023]