48945
domain: N
Appears in sequences
- a(n)=a(n-1)+a(m), where m=2n-2-2^(p+1) and 2^p<n-1<=2^(p+1), for n >= 4.at n=34A050067
- Numbers k such that x^k + x^7 + 1 is irreducible over GF(2).at n=47A057477
- Numbers k>7 such that x^k + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1 is irreducible over GF(2).at n=33A057485
- Sum over the products of factorials of parts in all partitions of n where the sum runs over the number of different parts only.at n=8A107894
- Number of maximal sum-free subsets of {1,2,...,n}.at n=39A121269
- Number of Integer solutions to w^2 + x^2 + y^2 + z^2 < n^2; number of lattice points inside a 4-sphere of radius n.at n=10A319617
- Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and n+2 equally spaced points along the diameter (a total of 2n+2 points). See Comments for precise definition.at n=18A333519