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1, 4, 12, 48, 144, 440, 1816, 6816, 25816, 101856, 397944, 1573464, 6274560, 25071152, 100180872, 400625360
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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In trying to understand A253086, this subsequence looked like the best place to attack it. But there is unfortunately no obvious formula even here.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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