Irregular triangle, read by rows: T(n, k) = [x^k]( y(n, x) ), where y(n, x) = - 2*y(3, x) - x*y(n-1, x) + 2*x^2*y(n-1, x) + x^2*y(n-2, x), and y(1, x) = -8 - 3*x + 8*x^2, y(2, x) = 4 - 4*x - 10*x^2 + 4*x^3 + 4*x^4, y(3, x) = -8 + 4*x + 24*x^2 - 9*x^3 - 24*x^4 + 4*x^5 + 8*x^6.
A131641
Irregular triangle, read by rows: T(n, k) = [x^k]( y(n, x) ), where y(n, x) = - 2*y(3, x) - x*y(n-1, x) + 2*x^2*y(n-1, x) + x^2*y(n-2, x), and y(1, x) = -8 - 3*x + 8*x^2, y(2, x) = 4 - 4*x - 10*x^2 + 4*x^3 + 4*x^4, y(3, x) = -8 + 4*x + 24*x^2 - 9*x^3 - 24*x^4 + 4*x^5 + 8*x^6.
Terms
- a(0) =-8a(1) =-3a(2) =8a(3) =4a(4) =-4a(5) =-10a(6) =4a(7) =4a(8) =-8a(9) =4a(10) =24a(11) =-9a(12) =-24a(13) =4a(14) =8a(15) =16a(16) =0a(17) =-64a(18) =-2a(19) =95a(20) =2a(21) =-64a(22) =0a(23) =16a(24) =16a(25) =-24a(26) =-24a(27) =86a(28) =-54a(29) =-116
External references
- oeis: A131641