4194312

Appears in sequences

• Number of ways of 4-coloring a map in which there is a central circle surrounded by an annulus divided into n-1 regions. There are n regions in all.at n=17A090860
• (Smallest prime >= 2^n) + (largest prime <= 2^n).at n=21A092507
• a(n) = 8*(2^n + 1).at n=19A175161
• a(n) = 2^n + 8.at n=22A242475
• Number of fundamentally different graceful labelings of the complete tripartite graph K_{1,1,n}.at n=22A339891