34726

Appears in sequences

• Triangle T(n,k) giving number of fixed 5 X k polyominoes with n cells (n >= 5, 1<=k<=n-4).at n=43A059681
• Number of permutations of length n which avoid the patterns 2134, 3214, 4123.at n=9A116805
• Expansion of (1+3*x+9*x^2+9*x^3+9*x^4+3*x^5+x^6) /( (1+x)^2 * (1-x)^5 ).at n=17A175898
• a(n) = (35*n^4 - 35*n^3 + 55*n^2 - 25*n + 6)/6.at n=8A181343