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A119305
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Riordan array (1-4x,x(1-x)^3).
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2
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1, -4, 1, 0, -7, 1, 0, 15, -10, 1, 0, -13, 39, -13, 1, 0, 4, -80, 72, -16, 1, 0, 0, 95, -228, 114, -19, 1, 0, 0, -66, 462, -484, 165, -22, 1, 0, 0, 25, -630, 1375, -875, 225, -25, 1, 0, 0, -4, 588, -2772, 3185, -1428, 294, -28, 1, 0, 0, 0, -372, 4092, -8463, 6324, -2170, 372
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Inverse of number triangle binomial(4n-k,n-k), A119304. Row sums are A119306.
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FORMULA
| Number triangle T(n,k)=(C(3k,n-k)+4*C(3k,n-k-1))(-1)^(n-k)
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EXAMPLE
| Triangle begins
1,
-4, 1,
0, -7, 1,
0, 15, -10, 1,
0, -13, 39, -13, 1,
0, 4, -80, 72, -16, 1,
0, 0, 95, -228, 114, -19, 1
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CROSSREFS
| Sequence in context: A011349 A060196 A204169 * A198215 A062175 A085659
Adjacent sequences: A119302 A119303 A119304 * A119306 A119307 A119308
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KEYWORD
| easy,sign,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), May 13 2006
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