32991

Appears in sequences

• G.f.: Product_{j>=1} Product_{i>=1} (1 + x^(i*j)).at n=29A107742
• a(n) = A064688(n) - 1.at n=19A123557
• Triangle read by rows: T(n,k) is the number of 2-compositions of n having k 0's in the top row A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.at n=57A181330
• Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n.at n=29A208972
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 189", based on the 5-celled von Neumann neighborhood.at n=35A270679
• Sum of the third largest parts in the partitions of n into 6 parts.at n=48A308871
• Least integer k in A031443 such that k*n is also in A031443, or -1 if there is no such k.at n=30A358857