40878

Appears in sequences

• a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026769.at n=7A027240
• A hierarchical sequence (S(W2{2}c) - see A059126).at n=11A059133
• Number of steps between two valleys at height 0 in the infinite Dyck path in which the k-th ascending line segment has A141285(k) steps and the k-th descending line segment has A194446(k) steps, k >= 1.at n=32A233968
• a(n) is the smallest integer m such that m-n is composite and phi(m+n) + sigma(m-n) = 2*m.at n=43A244447
• a(n) = A244447(A246626(n)).at n=3A246627
• Number of length 3+4 0..n arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two.at n=8A248990