23696

Appears in sequences

• Expansion of 1/(1 - x^2 - x^3 - x^4) = 1/((1 + x)*(1 - x - x^3)).at n=29A013979
• Dying rabbits: a(n) = a(n-1) + a(n-2) - a(n-5).at n=27A023435
• Expansion of (1-x)^(-1)/(1-x-2*x^2-x^3).at n=13A077864
• a(n) = floor(7^n/4^n).at n=18A094980
• Expansion of g.f.: (1-x^2-x^3)/( (1+x)*(1-x-x^3) ).at n=33A107458
• Fixed points of the permutation A087559.at n=27A131221
• Row sums of triangle A144334, binomial transform of [1, 2, 6, 7, 3, 0, 0, 0, ...].at n=20A144335
• Number of ways to place 3 nonattacking bishops on a 3 X n board.at n=18A172207
• Number of partitions p of n such that max(p) - min(p) = 10.at n=40A218573
• G.f.: Product_{k>=1} (1 + x^(k*(k+1))) / (1 - x^k).at n=33A280423
• Expansion of Product_{k>=1} ((1 + x^k)/(1 - x^k))^phi(k), where phi is the Euler totient function A000010.at n=16A318975