A002116
formatted as a simple table:
n
a(n)
0
2
1
20
2
402
3
14440
4
825502
5
69055260
6
7960285802
7
1209873973712
[2,20,402,14440,825502,69055260,7960285802, 1209873973712]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 8 08:31 EST 2009. Contains 170430 sequences.
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