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 A128414 Riordan array ((1-2x)/(1+2x),x/(1+2x)^2). 4
 1, -4, 1, 8, -8, 1, -16, 36, -12, 1, 32, -128, 80, -16, 1, -64, 400, -400, 140, -20, 1, 128, -1152, 1680, -896, 216, -24, 1, -256, 3136, -6272, 4704, -1680, 308, -28, 1, 512, -8192, 21504, -21504, 10560, -2816 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Inverse is A128417. Row sums are A128415. Diagonal sums are A128416. LINKS Table of n, a(n) for n=0..41. FORMULA T(n,k) = 2^(n-k)*A110162(n,k). - Philippe Deléham, Jan 18 2014 T(n,k) = T(n-1,k-1) - 4*T(n-1,k) - 4*T(n-2,k), T(0,0) = T(1,1) = T(2,2) = 1, T(1,0) = -4, T(2,0) = 8, T(2,1) = -8, T(n,k) = 0 if k<0 or if k>n. - Philippe Deléham, Jan 18 2014 EXAMPLE Triangle begins 1; -4, 1; 8, -8, 1; -16, 36, -12, 1; 32, -128, 80, -16, 1; -64, 400, -400, 140, -20, 1; 128, -1152, 1680, -896, 216, -24, 1; -256, 3136, -6272, 4704, -1680, 308, -28, 1; 512, -8192, 21504, -21504, 10560, -2816, 416, -32, 1; CROSSREFS Cf. A128413. Sequence in context: A232816 A210196 A249252 * A192014 A019699 A125092 Adjacent sequences: A128411 A128412 A128413 * A128415 A128416 A128417 KEYWORD easy,sign,tabl AUTHOR Paul Barry, Mar 02 2007 STATUS approved

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Last modified May 29 08:30 EDT 2023. Contains 363029 sequences. (Running on oeis4.)