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Search: id:A060522
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| A060522 |
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Number of 4 X n grids of black and white cells, no 3 of same color vertically or horizontally contiguous. |
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+0
1
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| 10, 100, 378, 2030, 9484, 46746, 225654, 1098136, 5327258, 25875154, 125619088, 609970274, 2961628194, 14380186660, 69822244298
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The 1 X n, 2 X n, 3 X n versions satisfied recurrence relations of degrees 2, 3, 4 respectively, but I have done quite a lot of LLL work and failed to find a degree-5 relation for this one.
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CROSSREFS
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Sequence in context: A029774 A095920 A134556 this_sequence A086115 A111434 A092707
Adjacent sequences: A060519 A060520 A060521 this_sequence A060523 A060524 A060525
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KEYWORD
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nonn
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AUTHOR
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Tom Womack (tom(AT)womack.net)
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