20489

Appears in sequences

• a(n) = a(n-2) + a(n-5).at n=53A001687
• Number of binary words of length n in which the ones occur only in blocks of length at least 4.at n=25A005253
• Number of integer partitions of n with no adjacent parts of quotient 2.at n=43A350837
• Number of compositions of 5*n-3 into parts 2 and 5.at n=10A369843
• Expansion of (1 + x)^2/(1 - x^2*(1 + x)^3).at n=16A375317
• a(n) = Sum_{k=0..floor(2*n/5)} binomial(2*n-3*k,2*k).at n=13A391541