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A248668 as a simple table

na(n)
11
24
326
4260
53610
664472
71409006
836432076
91087911890
1036844580000
111395429571222
1258439837713556
132681526361893626
14133783187672365480
157210345924097089790
16417482356526745344732
1725844171201928905477026
181703359919973405018460976

[1,4,26,260,3610,64472,1409006,36432076,
 1087911890,36844580000,1395429571222,
 58439837713556,2681526361893626,
 133783187672365480,7210345924097089790,
 417482356526745344732,25844171201928905477026,
 1703359919973405018460976]