100886

Appears in sequences

• a(n) = (-1)^(n+1)*(3/4)*(9^n-1)*B(2*n) where B(k) denotes the k-th Bernoulli number.at n=6A090643
• Number of 0..3 arrays x(0..n-1) of n elements with each no smaller than the sum of its three previous neighbors modulo 4.at n=11A200663