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A121881 as a simple table

na(n)
11
21
31
41
55
621
7109
82621
946409
101290665
11143900249
1210827502009
131650671059149
14826986635160509
15267834927512726725
16226491424023176449909
17497347467521206399078801
18706331193237960728379843409

[1,1,1,1,5,21,109,2621,46409,1290665,143900249,
 10827502009,1650671059149,826986635160509,
 267834927512726725,226491424023176449909,
 497347467521206399078801,
 706331193237960728379843409]