20971521

Appears in sequences

• Cullen numbers: a(n) = n*2^n + 1.at n=20A002064
• Length of longest trail (i.e., path with all distinct edges) on the edges of an n-cube.at n=21A005985
• a(0) = 6; for n>0, a(n) = 2*a(n-1) - 1.at n=22A083575
• a(n) = 5*4^n+1.at n=11A199115
• a(n) = 10*8^n+1.at n=7A199557
• a(0)=0, a(1)=1, for n>1, a(n) = n<*>n, where k<*>m = k<+>k<+>...<+>k is the m-1-fold iteration of the operation <+> defined in A206853.at n=21A206960