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Table of n, a(n) for n=0..23.
a(n) = 14*4^n - 1.
a(n) = (A199207(n+1) -3)/2 for n>=0.
(MAGMA) [14*4^n-1 : n in [0..30]];
(PARI) a(n)=14*4^n - 1 \\ Charles R Greathouse IV, May 05 2014
Sequence in context: A158485 A005902 A051798 * A061161 A212053 A210290
Adjacent sequences: A206369 A206370 A206371 * A206373 A206374 A206375
Brad Clardy, Feb 07 2012