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 A113290 Matrix logarithm of triangle A113287. 5
 0, 2, 0, -3, 0, 0, 6, 4, 4, 0, -10, -10, -10, 0, 0, 19, 24, 30, 12, 6, 0, -35, -49, -70, -42, -21, 0, 0, 72, 104, 164, 128, 84, 24, 8, 0, -150, -216, -360, -324, -252, -108, -36, 0, 0, 343, 480, 820, 800, 710, 400, 180, 40, 10, 0, -803, -1089, -1870, -1892, -1826, -1210, -660, -220, -55, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..65. FORMULA T(n, 1) = (n+1)*A113291(n). EXAMPLE Triangle begins: 0; 2,0; -3,0,0; 6,4,4,0; -10,-10,-10,0,0; 19,24,30,12,6,0; -35,-49,-70,-42,-21,0,0; 72,104,164,128,84,24,8,0; -150,-216,-360,-324,-252,-108,-36,0,0; 343,480,820,800,710,400,180,40,10,0; ... PROG (PARI) {T(n, k)=local(x=X+O(X^(n+2)), y=Y+O(Y^(n+2)), M=matrix(n+1, n+1, r, c, if(r==c, 1, if(r>c, r*polcoeff(polcoeff(1/(1-x*y)+x/((1-x*y)*(1+x+x*y)), r-1, X), c-1, Y))))); if(n

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Last modified April 21 20:45 EDT 2024. Contains 371885 sequences. (Running on oeis4.)