62216
domain: N
Appears in sequences
- Number of transpositions needed to generate permutations of length n.at n=7A001540
- 4-dimensional analog of centered polygonal numbers.at n=20A006323
- First diagonal of A027516.at n=13A027519
- Number of conjugacy classes of elements of order n in 2.E_7(C).at n=32A045515
- a(n) = a(n-1) + a(n-2) - [a(n-2)/4] - [a(n-4)/2] - [a(n-6)/4].at n=39A173599
- a(n) = Sum_{k=0..n} r_4(k^2 + 1), where r_4(k) is the number of ways of writing k as a sum of 4 squares (A000118).at n=25A333174