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A187223
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Differences between A147562 (Ulam-Warburton cellular automaton) and A187220 (Gullwing sequence).
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1
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0, 0, 2, 2, 6, 2, 6, 2, 14, 2, 6, 2, 14, 2, 6, -14, 30, 2, 6, 2, 14, 2, 6, -14, 30, 2, 6, -14, 22, -22, -34, -102, 62, 2, 6, 2, 14, 2, 6, -14, 30, 2, 6, -14, 22, -22, -34, -102, 62, 2, 6
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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Apparently the Gullwing sequence A187220 is the connection between the Ulam-Warburton C. A. (A147562) and the toothpick sequence A139250.
For another version which contains only positive terms and is more synchronous see the triangle A187564.
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LINKS
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FORMULA
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EXAMPLE
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Contribution from Omar E. Pol, Aug 25 2012 (Start):
Written as a triangle the sequence begins:
0,
0,
2,
2,6,
2,6,2,14,
2,6,2,14,2,6,-14,30,
2,6,2,14,2,6,-14,30,2,6,-14,22,-22,-34,-102,62,
2,6,2,14,2,6,-14,30,2,6,-14,22,-22,-34,-102,62,2,6,...
(End)
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CROSSREFS
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KEYWORD
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sign,tabf
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AUTHOR
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STATUS
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approved
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