1904176

Appears in sequences

• a(n) = (9n^4 - 18n^3 + 18n^2 - 9n + 2)/2.at n=25A079903
• Numerator of (9*(n^4 - 2*n^3 + 2*n^2 - n) + 2)/(2*(2*n-1)).at n=25A096430
• Triangular numbers representable as triangular(x)*triangular(y)+1.at n=34A226389