177331

Appears in sequences

• Triangle of coefficients in expansion of (x+1)*(x+3)*...*(x + 2n - 1) in rising powers of x.at n=30A028338
• Coefficient of x^2 in expansion of (x+1)*(x+3)*...*(x+2*n-1).at n=5A028339
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 81 ones.at n=9A031849
• Triangle of coefficients in expansion of (1+x)*(1+3x)*(1+5x)*(1+7x)*...*(1+(2n-1)x).at n=33A109692
• a(n) = 1 + (1200 + (634 + (225 + (85 + (15 + n)*n)*n)*n)*n)*n/720.at n=20A145128