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A147720
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Riordan array (1, x(1-x)/(1-3x)).
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5
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1, 0, 1, 0, 2, 1, 0, 6, 4, 1, 0, 18, 16, 6, 1, 0, 54, 60, 30, 8, 1, 0, 162, 216, 134, 48, 10, 1, 0, 486, 756, 558, 248, 70, 12, 1, 0, 1458, 2592, 2214, 1168, 410, 96, 14, 1, 0, 4374, 8748, 8478, 5160, 2150, 628, 126, 16
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OFFSET
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0,5
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COMMENTS
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Array [0,2,1,0,0,0,....] DELTA [1,0,0,0,......] for Deléham DELTA as in A084938.
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins
1;
0, 1;
0, 2, 1;
0, 6, 4, 1;
0, 18, 16, 6, 1;
0, 54, 60, 30, 8, 1;
0, 162, 216, 134, 48, 10, 1;
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MATHEMATICA
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nmax=9; Flatten[CoefficientList[Series[CoefficientList[Series[(1-3*x)/(1-(3+y)*x+y*x^2), {x, 0, nmax}], x], {y, 0, nmax}], y]] (* Indranil Ghosh, Mar 10 2017, after Philippe Deléham *)
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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