49879

Appears in sequences

• Number of permutations of length n which avoid the patterns 1234, 2143, 3421.at n=38A116842
• a(n) = A289671(n)/2^f(n), where f(n) = 2*floor((n-1)/3) + ((n+2) mod 3) = A004523(n).at n=47A289677
• a(n) = A289677(3*n).at n=15A290441