122326

Appears in sequences

• Essentially series series-parallel networks with n labeled edges, multiple edges not allowed.at n=8A058380
• Number of nX2 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=9A281557
• a(n) = n*(n^3 + 2*n^2 - 5*n + 10)/8.at n=31A294259