80198051

Appears in sequences

• a(n) = 4*a(n-1) - a(n-2), with a(0) = 1, a(1) = 1.at n=15A001835
• a(n) = 4*a(n-2) - a(n-4) for n > 1, a(n) = n for n = 0, 1.at n=29A002530
• a(n) = (1 + a(n-1)*a(n-2))/a(n-3), a(0) = a(1) = a(2) = 1.at n=30A005246
• a(2n+1) = a(2n) + a(2n-1), a(2n) = 2*a(2n-1) + a(2n-2); a(n) = n for n = 0, 1.at n=29A048788
• a(n) = 4*a(n-1) - a(n-2) with a(1) = 1, a(2) = 3.at n=14A079935
• Expansion of x*(1 + x)*(1 - 3*x^2)/(1 - 4*x^2 + x^4).at n=30A122573
• Expansion of x*(1 + x)*(1 - 3*x^2)/(1 - 4*x^2 + x^4).at n=31A122573
• Numbers k such that k^2 is of the form 3*m^2 + 2*m + 1 (A056109).at n=7A122769
• Number of Khalimsky-continuous functions with a three-point codomain.at n=26A131887
• Interleave denominators and numerators of convergents to sqrt(3).at n=42A140827
• a(n) = numerator(r(n)) where r(n) = (((1/2)*(sqrt(3) + 1))^n - ((1/2)*(sqrt(3) - 1))^n * cos(Pi*n))/sqrt(3).at n=29A305491
• Diagonals of a Euclidian solid such that there exists a Pythagorean quadruple d^2=a^2+b^2+c^2 that is more cube-like than any prior value of d.at n=20A375098