21402

Appears in sequences

• a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=3, a(2)=1, and a(3)=2.at n=10A024963
• a(0) = 0; for n>0, a(n) = maximal number of regions into which space can be divided by n spheres.at n=41A046127
• McKay-Thompson series of class 26A for Monster.at n=32A058596
• Number of partitions p of n such that max(p) - (number of parts of p) is a part of p.at n=46A238544
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 78", based on the 5-celled von Neumann neighborhood.at n=43A270093
• Expansion of 1 / ((1-x)^2*(1-x^2)*(1-x^3)*...*(1-x^8)).at n=32A288343
• Numbers n such that n * x/(x-1) produces a rotation of the digits in n for some value of x.at n=23A288669
• a(n) = number of partitions p of n such that the least multiplicity of the parts of p is a part of p.at n=38A365614