Irregular triangle read by rows: row n consists of the coefficients in the expansion of the polynomial (1/(2*w)) * (x^2 + x) * ((((v + w)/2)^(n - 1)) * (x^2 + 2*x + 4 + w) - (((v - w)/2)^(n - 1)) * (x^2 + 2*x + 4 - w)), where v = x^2 + 4*x + 4 and w = sqrt(x^4 + 4*x^3 + 12*x^2 + 20*x + 12).
A386874
Irregular triangle read by rows: row n consists of the coefficients in the expansion of the polynomial (1/(2*w)) * (x^2 + x) * ((((v + w)/2)^(n - 1)) * (x^2 + 2*x + 4 + w) - (((v - w)/2)^(n - 1)) * (x^2 + 2*x + 4 - w)), where v = x^2 + 4*x + 4 and w = sqrt(x^4 + 4*x^3 + 12*x^2 + 20*x + 12).
Terms
- a(0) =0a(1) =1a(2) =1a(3) =0a(4) =4a(5) =7a(6) =4a(7) =1a(8) =0a(9) =15a(10) =40a(11) =42a(12) =23a(13) =7a(14) =1a(15) =0a(16) =56a(17) =201a(18) =306a(19) =262a(20) =140a(21) =48a(22) =10a(23) =1a(24) =0a(25) =209a(26) =943a(27) =1877a(28) =2189a(29) =1672
External references
- oeis: A386874