Irregular triangle read by rows: let c = -(x - x^2), b = (-1 - a + 2 x)/x, and a = 0, expansion of p(x, n) = (a + b*x)*p(x, n - 1) + c*p(x, n - 2).
A139144
Irregular triangle read by rows: let c = -(x - x^2), b = (-1 - a + 2 x)/x, and a = 0, expansion of p(x, n) = (a + b*x)*p(x, n - 1) + c*p(x, n - 2).
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =-1a(5) =0a(6) =1a(7) =-3a(8) =2a(9) =0a(10) =1a(11) =-4a(12) =6a(13) =-3a(14) =0a(15) =1a(16) =-5a(17) =10a(18) =-10a(19) =4a(20) =0a(21) =-1a(22) =6a(23) =-15a(24) =20a(25) =-15a(26) =5a(27) =0a(28) =1a(29) =-9
External references
- oeis: A139144