21258
domain: N
Appears in sequences
- a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 2, -2, 1, 2.at n=17A025260
- Starting positions of strings of 3 0's in the decimal expansion of Pi.at n=17A050202
- Low-temperature partition function expansion for hexagonal lattice (Potts model, q=4).at n=23A057389
- Interprimes which are of the form s*prime, s=18.at n=38A075293
- A121153 \ A005836.at n=10A170830
- a(n)=a(n-1)+a(n-2)+n+4, a(0)=0, a(1)=1.at n=17A210675