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A149853 as a simple table

na(n)
01
12
25
313
435
5104
6318
71014
83256
910543
1034937
11116848
12397242
131354804
144641335
1516053619
1655784113
17195466771
18686258063
192416219435
208551265471
2130349165784
22108247450688
23386615499598
241383536609787
254967118466568
2617866856266359
2764477119071662
28232917119736270
29842589117795023
303054850488851820

[1,2,5,13,35,104,318,1014,3256,10543,34937,116848,
 397242,1354804,4641335,16053619,55784113,
 195466771,686258063,2416219435,8551265471,
 30349165784,108247450688,386615499598,
 1383536609787,4967118466568,17866856266359,
 64477119071662,232917119736270,842589117795023,
 3054850488851820]