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A303652 as a simple table

n a(n)
0 1
1 4
2 23
3 269
4 6080
5 263107
6 21755790
7 3448734174
8 1054337703035
9 625864795912552
10 726009710371573669
11 1654701176883966564948
12 7441600457415936633083792
13 66248198041546539808288183964
14 1170186904620869164091169463554964
15 41080483613395453869669149072267922983

[1,4,23,269,6080,263107,21755790,3448734174,
 1054337703035,625864795912552,726009710371573669,
 1654701176883966564948,7441600457415936633083792,
 66248198041546539808288183964,
 1170186904620869164091169463554964,
 41080483613395453869669149072267922983]

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Last modified December 8 04:31 EST 2019. Contains 329850 sequences. (Running on oeis4.)