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A143918 as a simple table

na(n)
01
12
25
314
447
5194
6977
75870
841099
9328802
102959229
1129592302
12325515335
133906184034
1450780392457
15710925494414
1610663882416227
17170622118659650
182900576017214069
1952210368309853262
20991996997887211999
2119839939957744240002
22416638739112629040065

[1,2,5,14,47,194,977,5870,41099,328802,2959229,
 29592302,325515335,3906184034,50780392457,
 710925494414,10663882416227,170622118659650,
 2900576017214069,52210368309853262,
 991996997887211999,19839939957744240002,
 416638739112629040065]