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Search: id:A132731
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| 1, 1, 1, 1, 2, 1, 1, 4, 4, 1, 1, 6, 10, 6, 1, 1, 8, 18, 18, 8, 1, 1, 10, 28, 38, 28, 10, 1, 1, 12, 40, 68, 68, 40, 12, 11, 14, 54, 110, 138, 110, 54, 14, 1, 1, 16, 70, 166, 250, 250, 166, 70, 16, 1
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Row sums = A132732: (1, 2, 4, 10, 24, 54, 116,...).
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FORMULA
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2*A007318 + A103451 - 2*A000012 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1;
1, 2, 1;
1, 4, 4, 1;
1, 6, 10, 6, 1;
1, 8, 18, 18, 8, 1;
1, 10, 28, 38, 28, 10, 1;
1, 12, 40, 68, 68, 40, 12, 1;
...
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CROSSREFS
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Cf. A007318, A103451, A000012.
Sequence in context: A026659 A026386 A147532 this_sequence A128966 A055907 A096806
Adjacent sequences: A132728 A132729 A132730 this_sequence A132732 A132733 A132734
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 26 2007
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