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A111675 as a simple table

n a(n)
1 1
2 31
3 331
4 15331
5 7515331
6 5257515331
7 78755257515331
8 12600078755257515331
9 252000012600078755257515331
10 30240000252000012600078755257515331
11 15120000030240000252000012600078755257515331 

[1,31,331,15331,7515331,5257515331,78755257515331,
 12600078755257515331,252000012600078755257515331,
 30240000252000012600078755257515331,
 15120000030240000252000012600078755257515331]

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Last modified April 25 13:22 EDT 2024. Contains 371969 sequences. (Running on oeis4.)