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A007018 as a simple table

n a(n)
0 1
1 2
2 6
3 42
4 1806
5 3263442
6 10650056950806
7 113423713055421844361000442
8 12864938683278671740537145998360961546653259485195806 

[1,2,6,42,1806,3263442,10650056950806,
 113423713055421844361000442,
 12864938683278671740537145998360961546653259485195\
 806]

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Last modified April 19 14:10 EDT 2024. Contains 371792 sequences. (Running on oeis4.)