18925047

Appears in sequences

• a(n) = sum of the first n coefficients of (1+x+x^2)^n.at n=15A055217
• T(n,k)=Number of 0..2 arrays of length n+2*k-1 with sum less than 2*k in any length 2k subsequence (=less than 50% duty cycle).at n=28A212729
• Number of 0..2 arrays of length 2*n with sum less than 2*n in any length 2n subsequence (=less than 50% duty cycle).at n=7A212730