A104028 Column 1 of triangle A104027, which is the matrix inverse of the triangle A056241 of even-indexed trinomial coefficients.

1, -3, 12, -73, 675, -9048, 166901, -4058703, 125837748, -4845013765, 226796981895, -12684595018992, 835391818484873, -63990023222817531, 5640684058036591260, -566948619030797914657, 64452061572236327204235, -8228252550026752605862344

Offset: 0

Author

Paul D. Hanna, Feb 26 2005

Keywords

• sign

Comments

Column 0 of triangle A104027 forms signed Hammersley's polynomial p_n(1) (A006846).

Crossrefs

Cf. A104027, A006846.

Programs

PARI

{a(n)=if(n<0,0,((matrix(n+2,n+2,m,j, if(m>=j,polcoeff((1+x+x^2)^(m-1)+O(x^(2*j)),2*j-2))))^-1)[n+2,2])}