28494

Appears in sequences

• Number of different terms in a period of continued fraction for square root of n-th repunit.at n=17A096488
• Array read by antidiagonals: T(m,n) = Sum_{i=1..m} i*(n-1+i)!.at n=25A100630
• Table read by antidiagonals: T(m,n) gives the ordinal number in the table of permutations of length n+1 of the permutation which reverses the first m+1 items on a list of length n+1, leaving the remaining items unaltered. For example, T(5,7) is 28494 and the 28494th row of the permutation table of order 8 is 5 4 3 2 1 0 6 7.at n=50A100711
• Number of nonisomorphic binary n X n matrices with two 1's per column under row and column permutations.at n=8A247417
• Numbers n such that n*prime(n) is a pandigital number containing digits 0-9 exactly once.at n=8A272552
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 581", based on the 5-celled von Neumann neighborhood.at n=30A273071
• a(n) is the number of vertices formed by n-secting the angles of a nonagon (enneagon).at n=40A335782
• Number of distinct edges among all circles that can be constructed on vertices of an n-sided regular polygon, using only a compass.at n=17A359047