27126

Appears in sequences

• 45-gonal numbers: n*(43*n-41)/2.at n=35A098924
• Number of functions on n labeled points to themselves (endofunctions) such that the number of cycles of f that have each even size is even.at n=6A212599
• Volume of Johnson square pyramid placed upright on cube (rounded down) with edge lengths equal to n.at n=27A227221
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 417", based on the 5-celled von Neumann neighborhood.at n=35A272018
• Number of nonempty subsets of {1..n} whose elements have a square average.at n=21A369391