124166

Appears in sequences

• Triangle of (Gaussian) q-binomial coefficients for q=-19.at n=12A015144
• a(n) = 7*a(n-1) - 14*a(n-2) + 7*a(n-3) with a(0)=0, a(1)=1, a(2)=4.at n=10A215493
• Number of length 2+3 0..n arrays with some pair in every consecutive four terms totalling exactly n.at n=12A245952
• a(n) = sigma_2(n)*sigma_3(n)/sigma(n).at n=18A320917