a(n) = T(8,n), array T given by A048471.

Terms

a(0) =1a(1) =257a(2) =1025a(3) =3329a(4) =10241a(5) =30977a(6) =93185a(7) =279809a(8) =839681a(9) =2519297a(10) =7558145a(11) =22674689a(12) =68024321a(13) =204073217a(14) =612219905a(15) =1836659969a(16) =5509980161a(17) =16529940737a(18) =49589822465a(19) =148769467649a(20) =446308403201