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A090648
a(n)=2*(4^n-1)/denominator(B(2n)) where B(k) denotes the k-th Bernoulli number.
+0
1
0, 1, 1, 3, 17, 31, 3, 5461, 257, 657, 6355, 60787, 12291, 22369621, 617093, 149943, 168, 43009, 5726623061, 71613, 91625968981, 162529435, 4870483401, 50991843607, 4990, 69107643, 12129927891, 34118178995231, 5664905191661
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
AT&T Labs Research
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