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1, 2, 6, 18, 52, 130, 310, 718, 1618, 3670, 8160, 17862, 38872, 84016, 180502, 386092, 821640, 1742536, 3681130, 7754076, 16290046, 34136028, 71378568, 148948138, 310248240, 645155196, 1339484196, 2777105128, 5750079046
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Paul Cooijmans, Numbers, Item 18.
Paul Cooijmans, Short Test For Genius, Item 29.
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CROSSREFS
| Equals A033844 - 1. Cf. A000040, A033844, A051438, A051440, A051439.
Sequence in context: A196593 A192237 A034525 * A128104 A027059 A078484
Adjacent sequences: A018246 A018247 A018248 * A018250 A018251 A018252
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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