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A139155 as a simple table

na(n)
44
516
691
7631
85041
945361
10453601
114989601
1259875201
13778377601
1410897286401
15163459296001
162615348736001
1744460928512001
18800296713216001
1915205637551104001
20304112751022080001
216386367771463680001

[4,16,91,631,5041,45361,453601,4989601,59875201,
 778377601,10897286401,163459296001,2615348736001,
 44460928512001,800296713216001,15205637551104001,
 304112751022080001,6386367771463680001]