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A116392
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Riordan array (1/sqrt(1-2x-3x^2), 1/sqrt(1-2x-3x^2)-1).
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3
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1, 1, 1, 3, 4, 1, 7, 13, 7, 1, 19, 42, 32, 10, 1, 51, 131, 128, 60, 13, 1, 141, 406, 475, 292, 97, 16, 1, 393, 1247, 1685, 1267, 561, 143, 19, 1, 1107, 3814, 5800, 5112, 2804, 962, 198, 22, 1, 3139, 11623, 19540, 19624, 12748, 5464, 1522, 262, 25, 1, 8953, 35334
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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FORMULA
| Number triangle T(n,k)=sum{j=0..n, C(n,j)*A116389(j,k)}.
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EXAMPLE
| Triangle begins
1,
1, 1,
3, 4, 1,
7, 13, 7, 1,
19, 42, 32, 10, 1,
51, 131, 128, 60, 13, 1
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CROSSREFS
| Row sums are A115967. Diagonal sums are A116394.
Sequence in context: A053707 A075052 A111516 * A174607 A105578 A198739
Adjacent sequences: A116389 A116390 A116391 * A116393 A116394 A116395
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Feb 12 2006
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