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A143808
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Triangle read by rows, first n terms of the sequence (1, 2, 4, 10, ...) followed by P(n), where (2, 4, 10, 12, ...) = twice Pell numbers.
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1
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1, 1, 1, 1, 2, 2, 1, 2, 4, 5, 1, 2, 4, 10, 12, 1, 2, 4, 10, 24, 29, 1, 2, 4, 10, 24, 58, 70, 1, 2, 4, 10, 24, 58, 140, 169, 1, 2, 4, 10, 24, 58, 140, 338, 408, 1, 2, 4, 10, 24, 58, 140, 338, 816, 985
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OFFSET
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0,5
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COMMENTS
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Row sums = A000129(n), the Pell numbers: (1, 2, 5, 12, ...).
First few rows of the triangle:
1;
1, 1;
1, 2, 2;
1, 2, 4, 5;
1, 2, 4, 10, 12;
1, 2, 4, 10, 24, 29;
1, 2, 4, 10, 24, 58, 70;
1, 2, 4, 10, 24, 58, 140, 169;
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LINKS
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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