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A219973 as a simple table

na(n)
01
11
25
335
4165
51177
69407
755657
8372429
92766100
1017671945
11118674685
12837152398
135531816082
1437328192350
15257252634864
161725117502706
1711666552132346
1879612474584518
19537157628862720
203636277021289585
2124711657036469040
22167150255133278869

[1,1,5,35,165,1177,9407,55657,372429,2766100,
 17671945,118674685,837152398,5531816082,
 37328192350,257252634864,1725117502706,
 11666552132346,79612474584518,537157628862720,
 3636277021289585,24711657036469040,
 167150255133278869]