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A249970
as a simple table
n
a(n)
1
1390
2
3055334
3
28638619086007684802380
4
296356838660564717696928980
5
296450546123962656267474730
[1390,3055334,28638619086007684802380, 296356838660564717696928980, 296450546123962656267474730]