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A061848 formatted as a simple table:

n a(n)
3 0
4 2
5 0
6 0
7 12
8 38
9 0
10 0
11 1172
12 0
13 14572
14 52536
15 0
16 0
17 2581112
18 0
19 35791472
20 0
21 0
22 1908889156
23 0
24 0
25 399822600756

[0,2,0,0,12,38,0,0,1172,0,14572,52536,0,0,2581112,
 0,35791472,0,0,1908889156,0,0,399822600756]

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.


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