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A131675 as a simple table

na(n)
01
16
21221
3231880
413443885
5340203456
64910472385
747565216504
8342540938025
91962871989130
109382270310061
1138701449021984
12141297910237237
13465502930269300
141404867737405385
153930816255364816
1610296122969028753
1725448298063869070
1859744930256741205

[1,6,1221,231880,13443885,340203456,4910472385,
 47565216504,342540938025,1962871989130,
 9382270310061,38701449021984,141297910237237,
 465502930269300,1404867737405385,3930816255364816,
 10296122969028753,25448298063869070,
 59744930256741205]