18417

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 90.at n=35A031588
• Number of rooted identity trees with 3-colored leaves.at n=9A038076
• a(1) = 2; a(n) = 9*2^(n-2) - n - 2, n>1.at n=12A054127
• Exponential transform of Pascal's triangle A007318.at n=30A055883
• Exponential transform of Pascal's triangle A007318.at n=33A055883
• Axially symmetric n-celled polyominoes with 1 hole.at n=12A057420
• Average of three successive primes squared, (prime(n)^2+prime(n+1)^2+prime(n+2)^2)/3, n>=3.at n=29A075893
• Number of partitions p of n such that #m(1) = #m(2), where #m(i) = number of numbers in p that have multiplicity i.at n=48A241518
• a(n) is the number of regions formed by n-secting the angles of an octagon.at n=36A335769