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 A086634 Triangle of coefficients, read by rows, where T(n,k) is the coefficient of x^n*y^k in f(x,y) that satisfies f(x,y) = (1+x) - x^2*(1+x)^3 + xy*f(x,y)^3. 4
 1, 1, 1, -1, 3, 3, -3, 0, 15, 12, -3, -14, 15, 84, 55, -1, -27, -75, 168, 495, 273, 0, -9, -270, -336, 1485, 3003, 1428, 0, 47, -252, -2352, -825, 12012, 18564, 7752, 0, 93, 525, -4032, -18315, 6006, 92820, 116280, 43263, 0, 69, 1875, 2940, -49005, -129129, 129948, 697680, 735471, 246675 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS The main diagonal gives A001764 ( C(3n,n)/(2n+1) ). First column is given by g.f: (1+x) - x^2*(1+x)^3. Antidiagonal sums result in binomial {1,1,0,...}. LINKS EXAMPLE Rows begin: {1}, {1,1}, {-1,3,3}, {-3,0,15,12}, {-3,-14,15,84,55}, {-1,-27,-75,168,495,273}, {0,-9,-270,-336,1485,3003,1428}, {0,47,-252,-2352,-825,12012,18564,7752}, ... CROSSREFS Cf. A086635 (row sums), A086632. Sequence in context: A320785 A164884 A019801 * A066601 A110566 A126066 Adjacent sequences:  A086631 A086632 A086633 * A086635 A086636 A086637 KEYWORD sign,tabl AUTHOR Paul D. Hanna, Jul 25 2003 STATUS approved

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Last modified December 4 02:18 EST 2020. Contains 338921 sequences. (Running on oeis4.)