135308

Appears in sequences

• Size of the Hilbert basis of the cone { x in Z+^n : (a,x)=0 } where a=(-1,1,2,...,n-2,-(n-1)).at n=26A141347
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) - b(n-2) - 1, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=23A294424
• a(n) is the number of concave n-celled polyominoes in the {4,5} tessellation of the hyperbolic plane.at n=12A390199