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 A155993 A triangle of polynomial coefficients: p(x,n)=-(ChebyshevT[n, x] - ((x + 1)^n + (1 - x)^n)); sp(x,n) = p(x, n) + x^n*p(1/x, n). 0
 2, 1, 1, 3, 0, 3, -2, 9, 9, -2, -5, 0, 40, 0, -5, -14, 5, 40, 40, 5, -14, -27, 0, 90, 0, 90, 0, -27, -62, 21, 154, 14, 14, 154, 21, -62, -125, 0, 400, 0, -40, 0, 400, 0, -125, -254, 9, 648, 288, -180, -180, 288, 648, 9, -254, -507, 0, 1410, 0, 120, 0, 120, 0, 1410, 0, -507 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Row sums are: {2, 2, 6, 14, 30, 62, 126, 254, 510, 1022, 2046,...}. LINKS FORMULA p(x,n)=-(ChebyshevT[n, x] - ((x + 1)^n + (1 - x)^n)); sp(x,n) = p(x, n) + x^n*p(1/x, n). EXAMPLE {2}, {1, 1}, {3, 0, 3}, {-2, 9, 9, -2}, {-5, 0, 40, 0, -5}, {-14, 5, 40, 40, 5, -14}, {-27, 0, 90, 0, 90, 0, -27}, {-62, 21, 154, 14, 14, 154, 21, -62}, {-125, 0, 400, 0, -40, 0, 400, 0, -125}, {-254, 9, 648, 288, -180, -180, 288, 648, 9, -254}, {-507, 0, 1410, 0, 120, 0, 120, 0, 1410, 0, -507} MATHEMATICA p[x_, n_] = -(ChebyshevT[n, x] - ((x + 1)^n + (1 - x)^n)); sp[x_, n_] = p[x, n] + x^n*p[1/x, n]; Table[FullSimplify[ExpandAll[sp[x, n]]], {n, 0, 10}]; Table[CoefficientList[FullSimplify[ExpandAll[sp[x, n]]], x], {n, 0, 10}]; Q Flatten[%] CROSSREFS Sequence in context: A033774 A033804 A103910 * A210806 A147867 A227431 Adjacent sequences:  A155990 A155991 A155992 * A155994 A155995 A155996 KEYWORD sign,tabl,uned AUTHOR Roger L. Bagula, Feb 01 2009 STATUS approved

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Last modified October 23 16:46 EDT 2019. Contains 328373 sequences. (Running on oeis4.)