1,1

V. J. W. Guo and J. Zeng, The number of convex polyominoes and the generating function of Jacobi polynomials.

(3n+2)/(n+2)*C(2n+4, 4) - 4n/(n+2)*C(n+2, n)^2, n>0.

(1/6) (6n^4 + 20n^3 + 27n^2 + 19n + 6).

Row 2 of triangle A093118.

Sequence in context: A086689 A141956 A137720 this_sequence A137188 A055338 A055880

Adjacent sequences: A093116 A093117 A093118 this_sequence A093120 A093121 A093122

nonn,tabl

Ralf Stephan, Mar 21 2004