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2, 2, 1, 4, 1, 1, 8, 1, 1, 2, 16, 2, 1, 1, 4, 32, 4, 1, 1, 2, 8, 64, 8, 2, 1, 1, 4, 16, 128, 16, 4, 1, 1, 2, 8, 32, 256, 32, 8, 2, 1, 1, 4, 16, 64, 512, 64, 16, 4, 1
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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COMMENTS
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Note that the positions of the first occurrences of 4, 8, 16, 32, 64, ... are 3, 6, 10, 15, 21, ...
So a(n) can be displayed as a triangle (hence the tabl keyword), with row sums: 2, 3, 6, 12, 24, 48, ... = A042950.
2;
2, 1;
4, 1, 1;
8, 1, 1, 2;
It can also be displayed as an irregular table, with length distribution: 1, 1, 3, 3, 5, 5, 7, 7, 9, 9 (doubled A005408) to get palindromic lines.
2;
2;
1, 4, 1;
1, 8, 1;
1, 2, 16, 2, 1;
1, 4, 32, 4, 1;
with row sums: 2, 2, 6, 10, 22, 42, 66, 170, 342, 682, ... = A078008(n+2) = 2*A001045(n+1).
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LINKS
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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