12078909

Appears in sequences

• a(n) = Sum_{k=0..floor(n/4)} binomial(n-2k,2k).at n=36A005252
• a(n) = floor((Fibonacci(2*n+1)+1)/2).at n=18A087953
• A Fibonacci convolution.at n=36A094686
• a(n) = floor[(phi + n mod 2)*a(n-1)], a(1)=1.at n=24A107857
• a(n) = b(k), where b(k) = Fibonacci(n-1) and k = floor( n*(1+sqrt(5))/2 ).at n=24A107858
• Antidiagonal sums of number triangle A086645.at n=18A108479
• Expansion of (1-x)^3/(1-4x+5x^2-4x^3+x^4).at n=18A109961
• Number of nonnegative even integers <= Fibonacci(n).at n=37A147997
• a(n) = ceiling(Fibonacci(n)/2).at n=37A173173
• a(n) = (A000045(n)+A173432(n))/2.at n=36A173433
• Expansion of (1-3*x)/(1-5*x+3*x^2+x^3).at n=12A232970
• a(n) = 3*a(n-1) + 5*a(n-2) + a(n-3), with a(0) = a(1) = 1 and a(2) = 7, a linear recurrence which is a trisection of A005252.at n=12A294262
• Numbers k such that the k-th centered 40-gonal numbers (A195317) is a square.at n=12A351354