185124225

Appears in sequences

• a(n+1) - 3*a(n) + a(n-1) = (2/3)*(1+w^(n+1)+w^(2*n+2)); a(1) = 0, a(2) = 1; where w is the cubic root of unity.at n=20A072130
• Second member of the Diophantine pair (m,k) that satisfies 5*(m^2 + m) = k^2 + k; a(n) = k.at n=13A077262
• a(n) = floor(Lucas(n+1)/2), Lucas(n) = A000032(n).at n=40A173714
• Partial sums of odd Fibonacci numbers (A014437).at n=26A174542
• Size (b^3_n) of unit sphere in a certain graph (see Hazama article for precise definition).at n=39A199935
• a(0)=a(1)=1, a(n+2) = a(n+1) + a(n) - A128834(n).at n=41A226956
• Smallest nonnegative integer not expressible by the addition and subtraction of fewer than n Lucas numbers.at n=14A364754