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A051696 as a simple table

na(n)
11
22
33
48
55
6144
77
8128
981
106400
1111
12248832
1313
14100352
1591125
1632768
1717
18429981696
1919
20163840000
216751269
2263438848
2323
24247669456896
2515625
261417674752
271594323
2880564191232
2929
3025076532510720000000
3131
322147483648

[1,2,3,8,5,144,7,128,81,6400,11,248832,13,100352,
 91125,32768,17,429981696,19,163840000,6751269,
 63438848,23,247669456896,15625,1417674752,1594323,
 80564191232,29,25076532510720000000,31,2147483648]