26684

Appears in sequences

• Symmetrical form of A039683 using polynomials: p(x,n)=Product[x - (2*i), {i, 0, Floor[n/2]}]/x; t(n,m)=coefficients(p(x,n)+x^n*p(1/x,n)); t(n,m)=A039683(n,m)+A039683(n,n-m).at n=23A155718
• Symmetrical form of A039683 using polynomials: p(x,n)=Product[x - (2*i), {i, 0, Floor[n/2]}]/x; t(n,m)=coefficients(p(x,n)+x^n*p(1/x,n)); t(n,m)=A039683(n,m)+A039683(n,n-m).at n=25A155718
• Number of 5-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=21A187379
• Number of secondary structures of size n having no stacks of length 1.at n=21A202840
• Number of partitions of n with difference 4 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=43A242695
• Irregular triangle read by rows: rows are partial alternating sums of rows of A297191.at n=54A297193
• Irregular triangle read by rows: rows are partial alternating sums of rows of A297191.at n=58A297193
• Left-hand half of triangle A297193.at n=33A297194
• Number of vertices formed when n equally spaced points are placed around a circle and all pairs of points are joined by an interior arc whose radius equals the circle's radius.at n=27A371254