122475

Appears in sequences

• Determinant of rank n matrix of 1..n^2 filled successively back and forth along antidiagonals.at n=6A078475
• a(n) = Sum_{i=1..n, j=1..n, gcd(i,j)=1} (n+1-i)*(n+1-j).at n=28A115004
• a(n) = 625*n^2 - 25.at n=13A157918
• a(n) = 196*n^2 - n.at n=24A158003
• Odd decagonal pyramidal numbers.at n=22A218330
• a(n) = A115004(2n+1).at n=14A331759