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A042405 as a simple table

n a(n)
0 1
1 54
2 2917
3 157572
4 8511805
5 459795042
6 24837444073
7 1341681774984
8 72475653293209
9 3915026959608270
10 211483931472139789
11 11424047326455156876
12 617110039560050611093
13 33335366183569188155898
14 1800726883952296211029585
15 97272587099607564583753488

[1,54,2917,157572,8511805,459795042,24837444073,
 1341681774984,72475653293209,3915026959608270,
 211483931472139789,11424047326455156876,
 617110039560050611093,33335366183569188155898,
 1800726883952296211029585,
 97272587099607564583753488]

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Last modified August 20 23:06 EDT 2018. Contains 313929 sequences. (Running on oeis4.)