278125

Appears in sequences

• a(0)=1; a(1)=1; a(n)= a(n-1) + floor( sqrt(a(n-1)*a(n-2))+ sqrt(a(n-3)*a(n-4))+ ... ).at n=20A043327
• Second binomial transform of F(n+1).at n=10A081567
• Numbers j that are the hypotenuse of exactly 16 distinct integer-sided right triangles, i.e., j^2 can be written as a sum of two squares in 16 ways.at n=19A097238
• Triangle read by rows, giving Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).at n=41A123354
• Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).at n=5A123358
• Number of paths of length n starting at initial node of the path graph P_9.at n=21A178381
• Number of (n+2)X9 0..2 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.at n=11A186566
• a(n) = Sum_{k >= 0}(-1)^k*binomial(n,5*k).at n=21A289306
• a(n) = Sum_{k >= 0}(-1)^k*binomial(n,5*k+1).at n=21A289321