44837
domain: N
Appears in sequences
- Graded dimension of the space of invariant bilinear forms on the free pre-Lie algebra on one generator.at n=13A098091
- a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n-2)*a(n-2) + 1.at n=12A186739
- Number of 2nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to exactly one horizontal or vertical neighbor.at n=2A199090
- T(n,k)=Number of nXk 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to exactly one horizontal or vertical neighbor.at n=39A199092
- T(n,k)=Number of nXk 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to exactly one horizontal or vertical neighbor.at n=41A199092
- Centered truncated octahedral numbers: the number of integer triples (x,y,z) such that max(|x|,|y|,|z|) <= 2n and |x|+|y|+|z| <= 3n.at n=11A371515
- Semiprimes k such that k+2 and k+6 are primes and k+4 and k+8 are all semiprimes.at n=19A392186