66675

Appears in sequences

• 4-dimensional analog of centered polygonal numbers. Also number of regions created by sides and diagonals of a convex n-gon in general position.at n=37A006522
• Number of regions in regular n-gon with all diagonals drawn.at n=36A007678
• Step cyclic shifted sequence structures using a maximum of five different symbols.at n=12A056432
• Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 7.at n=44A137094
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (1, -1, 0), (1, -1, 1), (1, 1, 1)}.at n=9A149570
• Signed recurrence over enriched r-trees: a(n) = 2 * (-1)^n + Sum_y Product_{i in y} a(y) where the sum is over all integer partitions of n - 1.at n=36A301469
• a(n) = A007678(2*n+1).at n=18A341735