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A149953 as a simple table

na(n)
01
12
25
315
451
5183
6690
72680
810664
943361
10179166
11750618
123182815
1313627850
1458858838
15256136007
161121888880
174942820194
1821890082385
1997392793659
20435140490144
211951512891396
228782251791612
2339646601500866
24179495259553219
25814795429411189
263707690621124339
2716909746064544733

[1,2,5,15,51,183,690,2680,10664,43361,179166,
 750618,3182815,13627850,58858838,256136007,
 1121888880,4942820194,21890082385,97392793659,
 435140490144,1951512891396,8782251791612,
 39646601500866,179495259553219,814795429411189,
 3707690621124339,16909746064544733]