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A007481 Number of subsequences of [ 1,...,n ] in which each even number has an odd neighbor.
(Formerly M0828)
+0
4
1, 2, 3, 7, 11, 25, 39, 89, 139, 317, 495, 1129, 1763, 4021, 6279, 14321, 22363, 51005, 79647, 181657, 283667, 646981, 1010295, 2304257, 3598219, 8206733, 12815247, 29228713, 45642179, 104099605, 162557031, 370756241, 578955451, 1320467933 (list; graph; listen)
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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.


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