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Search: id:A135221
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| 1, 0, 1, 2, 1, 1, 0, 4, 2, 1, 2, 3, 7, 3, 1, 0, 6, 9, 11, 4, 1, 2, 5, 16, 19, 16, 5, 1, 0, 8, 20, 36, 34, 22, 6, 1, 2, 7, 29, 55, 71, 55, 29, 7, 1, 0, 10, 35, 85, 125, 127, 83, 37, 8, 1
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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row sums = A051049: (1, 1, 4, 7, 16, 31, 64,...).
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FORMULA
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A007318 + A000012(signed) - Identity matrix, where A000012(signed) = (1; -1,1; 1,-1,1;...)
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EXAMPLE
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First few rows of the triangle are:
1;
0, 1;
2, 1, 1;
0, 4, 2, 1;
2, 3, 7, 3, 1;
0, 6, 9, 11, 4, 1;
2, 5, 16, 19, 16, 5, 1;
0, 8, 20, 36, 34, 22, 6, 1;
2, 7, 29, 55, 71, 55, 29, 7, 1;
...
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CROSSREFS
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Cf. A007318, A051049.
Sequence in context: A124816 A124790 A147787 this_sequence A106234 A062507 A077875
Adjacent sequences: A135218 A135219 A135220 this_sequence A135222 A135223 A135224
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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), Nov 23 2007
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