32272

Appears in sequences

• Fifth subdiagonal in array of n-gonal numbers A081422.at n=31A081436
• a(n) = 2^(floor((n-1)/2)) - n*(n-1)/2.at n=31A163417
• Expansion of Product_{k>=1} ((1 + x^(k^2)) / (1 - x^(k^2)))^(k^2).at n=27A291666
• Number of n X 5 0..1 arrays with every element unequal to 0, 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.at n=9A304949
• a(n) is the number of free polyominoes with k cells and n-k distinguished vertices.at n=9A343417
• Positions of zeros in A345055, which is the Dirichlet inverse of A011772.at n=51A345053
• E.g.f.: exp(x) * (sec(x) - tan(x)) / (1 - x).at n=8A347071