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A218540 as a simple table

na(n)
01
11
21
35
410
566
6154
71122
82805
921505
1055913
11442221
121179256
139524760
1425852920
15211993944
16582983346
174835332458
1813431479050
19112400272050
20314720761740
212652646420380
227475639911980
2363380425340700
24179577871798650
251530003467724498

[1,1,1,5,10,66,154,1122,2805,21505,55913,442221,
 1179256,9524760,25852920,211993944,582983346,
 4835332458,13431479050,112400272050,314720761740,
 2652646420380,7475639911980,63380425340700,
 179577871798650,1530003467724498]