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A177553 as a simple table

na(n)
01
11
22
36
424
5120
6720
75039
840305
9362682
103626190
1139881160
12478490760
136219298800
1487055051511
151305598835941
1620885951018102
17354999461960226
186388879812001704
19121367620532150280
202426930566055020080
2150956684690331669759
221120852238721212726609

[1,1,2,6,24,120,720,5039,40305,362682,3626190,
 39881160,478490760,6219298800,87055051511,
 1305598835941,20885951018102,354999461960226,
 6388879812001704,121367620532150280,
 2426930566055020080,50956684690331669759,
 1120852238721212726609]