18317

Appears in sequences

• Number of partitions of n into parts not of the form 11k, 11k+2 or 11k-2. Also number of partitions with 1 part of size 1 and differences between parts at distance 4 are greater than 1.at n=46A035945
• Number of partitions satisfying (cn(0,5) = 0 and cn(1,5) = cn(4,5)).at n=57A036818
• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 7.at n=22A051972
• Number of permutations of length n which avoid the patterns 321, 2143, 3124; or avoid the patterns 132, 2314, 4312, etc.at n=38A116731
• a(n) = 1 + 4*n*(1 + 2*n^2)/3.at n=19A171272
• a(n) = floor(sqrt(5*2^n)).at n=26A221942
• Number of numbers in row n of the array at A243855.at n=22A243856
• Greatest integer k such that k/2^n < sqrt(5).at n=13A293331
• The number of regions formed when every pair of n points, placed at the vertices of a regular n-gon, are connected by a circle and where the points lie at the ends of the circle's diameter.at n=17A358782
• Number of compositions of 7*n into parts 3 and 7.at n=11A373909
• Expansion of 1 / ((1-x)^3 - x^7).at n=21A392544