Triangular array: row n gives the coefficients T(n,k) of powers x^(2k) in the series expansion of ((b^n + b^(-n))/2)^2, where b = x + sqrt(x^2 + 1).
A373504
Triangular array: row n gives the coefficients T(n,k) of powers x^(2k) in the series expansion of ((b^n + b^(-n))/2)^2, where b = x + sqrt(x^2 + 1).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =4a(6) =1a(7) =9a(8) =24a(9) =16a(10) =1a(11) =16a(12) =80a(13) =128a(14) =64a(15) =1a(16) =25a(17) =200a(18) =560a(19) =640a(20) =256a(21) =1a(22) =36a(23) =420a(24) =1792a(25) =3456a(26) =3072a(27) =1024a(28) =1a(29) =49
External references
- oeis: A373504