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A104571
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Triangle T(n,k) = A042948(n-k+1) read by rows, 0<=k<=n.
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0
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1, 4, 1, 5, 4, 1, 8, 5, 4, 1, 9, 8, 5, 4, 1, 12, 9, 8, 5, 4, 1, 13, 12, 9, 8, 5, 4, 1, 16, 13, 12, 9, 8, 5, 4, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| The triangle is extracted from the product of lower triangular matrices (with the rest of the terms all zeros): G * R (or R * G); G = [1; 3, 1; 1, 3, 1; 3, 1, 3, 1;...]; R = [1; 1, 1; 1, 1, 1;...].
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EXAMPLE
| The first few rows are:
1;
4, 1;
5, 4, 1;
8, 5, 4, 1;
9, 8, 5, 4, 1;
...
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CROSSREFS
| Cf. A042948, A035608 (row sums), A104570, A104569, A074377.
Sequence in context: A115210 A199150 A030352 * A105721 A099310 A021880
Adjacent sequences: A104568 A104569 A104570 * A104572 A104573 A104574
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KEYWORD
| nonn,tabl,easy
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 16 2005
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