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A266305 as a simple table

na(n)
01
11
27
374
41060
519013
6408650
710219360
8291158230
99302358947
10329192040880
1112775809098058
12539351216354728
1324600280965461923
141205263251360664310
1563115789721408960624
163517483455875467926588
17207834769804597591153769
1812976002600530598793672490

[1,1,7,74,1060,19013,408650,10219360,291158230,
 9302358947,329192040880,12775809098058,
 539351216354728,24600280965461923,
 1205263251360664310,63115789721408960624,
 3517483455875467926588,207834769804597591153769,
 12976002600530598793672490]