233030

Appears in sequences

• Number of fixed points in all 132- and 213-avoiding permutations of {1,2,...,n} (these are permutations with runs consisting of consecutive integers).at n=20A068018
• Expansion of (1-x)^(-1)/(1-x+2*x^2-2*x^3).at n=37A077874
• Partial sums of A166752.at n=19A166753
• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 or 00000011.at n=15A259716
• Numbers k(n) used for Markoff forms determining quadratic irrationals with purely periodic continued fractions.at n=30A305311