26300

Appears in sequences

• a(n) = n*(n + 1)*(11*n^2 + 11*n - 10)/24.at n=15A264854
• a(1)=0; for n>1, a(n) = 4*n^3 - 3*n^2 - 3*n + 4.at n=18A296363
• Row sums of the triangle A322550.at n=23A320043