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A112973
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Riordan array (1/(1-x-x^2), x/(1-x-x^2)^2).
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0
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1, 1, 1, 2, 4, 1, 3, 12, 7, 1, 5, 31, 31, 10, 1, 8, 73, 110, 59, 13, 1, 13, 162, 340, 267, 96, 16, 1, 21, 344, 956, 1022, 529, 142, 19, 1, 34, 707, 2507, 3479, 2416, 923, 197, 22, 1, 55, 1416, 6231, 10850, 9657, 4900, 1476, 261, 25, 1, 89, 2778, 14840, 31606, 34905
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Row sums are A091702. Diagonal sums are A052960. First column is A000045(n+1).
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EXAMPLE
| Rows begin
1;
1,1;
2,4,1;
3,12,7,1;
5,31,31,10,1;
8,73,110,59,13,1;
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CROSSREFS
| Sequence in context: A004515 A036560 A117297 * A162303 A128570 A157284
Adjacent sequences: A112970 A112971 A112972 * A112974 A112975 A112976
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Oct 07 2005
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