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A149957 as a simple table

na(n)
01
12
25
316
452
5182
6669
72504
89698
938195
10152767
11621076
122549560
1310581714
1444310835
15186883460
16794030970
173393309246
1814581119513
1962974335852
20273154359474
211189789622673
225201720413303
2322819093413662
24100426881360373
25443259890866905
261961797012311293
278704741535659198

[1,2,5,16,52,182,669,2504,9698,38195,152767,
 621076,2549560,10581714,44310835,186883460,
 794030970,3393309246,14581119513,62974335852,
 273154359474,1189789622673,5201720413303,
 22819093413662,100426881360373,443259890866905,
 1961797012311293,8704741535659198]