18364
domain: N
Appears in sequences
- a(n) = Sum_{k <= n/2 } binomial(n-2k, 3k).at n=21A137356
- Expansion of x*(1+7*x-6*x^3)/(1-8*x^2+6*x^4).at n=9A249310
- First diagonal of an array, generated from the sequence of the nonprimes.at n=10A354430
- Expansion of 1 + f/(1 + 2*f), where f is the g.f. of the swinging factorial (A056040).at n=11A355775
- Number of compositions of 5*n-2 into parts 3 and 5.at n=12A369847
- a(n) = Sum_{k=0..floor(2*n/3)} binomial(2*k+1,2*n-3*k).at n=15A392454