527878

Appears in sequences

• a(n) = (9n^4 - 18n^3 + 18n^2 - 9n + 2)/2.at n=18A079903
• Numerator of (9*(n^4 - 2*n^3 + 2*n^2 - n) + 2)/(2*(2*n-1)).at n=18A096430
• Hexagonal numbers (A000384) in which parity of digits alternates.at n=33A297645