1281280

Appears in sequences

• Seventh column of Lanczos triangle A053125 (decreasing powers).at n=4A054325
• Number of rooted unicursal planar maps with n edges and no vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).at n=8A069721
• A transform of binomial(n,6).at n=9A082140
• Triangle: row #n has n+1 terms. T(n,m) = 4^m (2n+1)! / ( (2n-2m)! (2m+1)! ).at n=32A085841
• Triangle T(n,k), 0 <= k <= n, defined by : T(n,k) = 0 if k < 0, T(0,k) = 0^k, (n+2)*(2*n-2*k+1)*T(n,k) = (2*n+1)*( 4*(2*n-2*k+1)*T(n-1,k-1) + (n+2*k+2)*T(n-1,k) ).at n=34A123382
• 7-quantum transitions in systems of N >= 7 spin 1/2 particles, in columns by combination indices.at n=28A213349
• Number of nX1 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes.at n=10A278604
• a(n) is the least integer that can be expressed as the difference of two octagonal numbers in exactly n ways.at n=23A334037