20378

Appears in sequences

• E.g.f.: Sum_{n>=0} a(n)*x^n/n! = {Sum_{n>=0} F(n+1)*x^n/n!}^2, where F(n) is the n-th Fibonacci number.at n=9A081057
• Number of binary strings of length n with no substrings equal to 0000 0010 or 1100.at n=14A164423
• Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=22A207106
• Number of 2 X 2 matrices M with terms in {1,...,n} such that permanent(M) > n.at n=12A212241
• The 180-degree spoke (or ray) of a hexagonal spiral of Ulam.at n=41A244806
• Numbers k at which point A336459(k) appears multiplicative, but A051027(k) does not.at n=36A336561