20906
domain: N
Appears in sequences
- Multiplicity of highest weight (or singular) vectors associated with character chi_115 of Monster module.at n=42A034503
- Numbers k such that 273*2^k-1 is prime.at n=40A050895
- Number of permutations p of 1,2,...,n satisfying p(i+2) - p(i) <> 2 for all 1 <= i <= n-2.at n=8A189281
- Number of length n+4 0..5 arrays with every five consecutive terms having four times some element equal to the sum of the remaining four.at n=16A249653
- p-INVERT of (1,2,3,5,7,11,13,...); i.e., 1 and the primes (A008578), where p(S) = 1 - S - S^2.at n=8A289928
- Number of subsets of [n] avoiding 3-term arithmetic progressions and containing n if n>0.at n=23A334893
- G.f. A(x) satisfies A(x) = 1 + x / (1 - x*A(x)^2)^4.at n=7A378733