68520
domain: N
Appears in sequences
- Expansion of e.g.f. (1-x)/(1-4*x+x^2).at n=5A052677
- Row sums of A163334 and A163336.at n=38A163342
- Expansion of x*(1 + x^2 - x^3) / ( (1-x)*(1-x-x^4) ).at n=33A168639
- Number of collections of nonempty multisets with a total of n objects of exactly two colors.at n=14A255942
- Numbers k such that (11*10^k - 149)/3 is prime.at n=23A281486
- Number of dihedral Carlitz compositions of n.at n=26A292906
- Branched catafusenes (cata-condensed benzenoids) without helicenes, symmetry C_s.at n=8A323923
- Expansion of e.g.f. exp( x^2/(1-x)^3 ) / (1-x)^2.at n=6A375224