813012

Appears in sequences

• Number of permutations of length n which avoid the patterns 1234, 1342, 4312.at n=20A116791
• G.f. satisfies: x = Sum_{n>=1} 1/A(x)^(6*n) * Product_{k=1..n} (1 - 1/A(x)^k).at n=7A209442