123081

Appears in sequences

• Number of polyiamonds with 2n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).at n=11A075218
• a(n) = n^4 - n^3 - n^2 - n - 1.at n=19A125082
• a(n) = (n^4 + 46*n^3 - 169*n^2 + 146*n + 24)/24.at n=32A143059
• Number of points of norm <= n in the bi-truncated cubic honeycomb (3-dimensional lattice, with truncated-octahedral cells).at n=31A276450