20633238

Appears in sequences

• a(n) = a(n-1) + a(n-2) + 1, with a(0) = 0 and a(1) = 2.at n=34A001610
• Number of restricted circular combinations.at n=33A006499
• Number of (marked) cyclic n-bit binary strings containing no runs of length > 2.at n=34A007040
• a(n) = Lucas(4n+3) - 1, or Lucas(2n+1)*Lucas(2n+2).at n=8A081019
• a(n) = Lucas(n) + (-1)^n.at n=35A099925
• a(n) = A014217(n+1) - A115360(n+2).at n=33A142584
• Position of first occurrence of n in A182576.at n=33A182580
• a(n) = numerator of B(0,n) where B(n,n) = 0, B(n-1,n) = 1/n, and B(m,n) = B(m-1,n+1) - B(m-1,n).at n=34A189731
• a(n) = L(n)*L(n+1), where L = A000032 (Lucas numbers).at n=17A215602
• Expansion of x*(1 + 2*x)/((1 - x)*(1 + x)*(1 - x - x^2)).at n=34A301653
• Number of nonempty subsets of {1, ..., n} containing no two cyclically successive elements.at n=35A324015