18779

Appears in sequences

• Number of n X n binary arrays with all ones connected only in a 0100-1111-0100 pattern in any orientation.at n=7A146373
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation.at n=17A146375
• G.f.: A(x) = exp( Sum_{n>=1} A162415(n)^2*x^n/n ) where A162415 is defined by: Sum_{n>=0} x^(2^n-1) = exp( Sum_{n>=1} A162415(n)*x^n/n ).at n=13A162416
• Number of 2n-digit primes that are concatenation of n two-digit distinct primes p_1...p_n, 98>p_1>p_2>...>p_n>10.at n=9A168513
• a(n) = prime(n) * prime(2*n-1).at n=23A219603
• Number of partitions p of n such that the number of parts having multiplicity 1 is not a part and max(p) - min(p) is a part.at n=52A241448
• Number of integer partitions of n whose negated run-lengths are not unimodal.at n=40A332639