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A068698 as a simple table

n a(n)
1 3
2 31
3 0
4 59575553
5 15131197
6 0
7 55535149474543
8 6361595755535149
9 0
10 1151131111091071051031019997
11 207205203201199197195193191189187
12 0
13 65636159575553514947454341
14 4543413937353331292725232119
15 0

[3,31,0,59575553,15131197,0,55535149474543,
 6361595755535149,0,1151131111091071051031019997,
 207205203201199197195193191189187,0,
 65636159575553514947454341,
 4543413937353331292725232119,0]

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Last modified November 27 14:41 EST 2022. Contains 358405 sequences. (Running on oeis4.)