a(n) = ((2+3*sqrt(2))*(5+sqrt(2))^n+(2-3*sqrt(2))*(5-sqrt(2))^n)/4.
A164031
a(n) = ((2+3*sqrt(2))*(5+sqrt(2))^n+(2-3*sqrt(2))*(5-sqrt(2))^n)/4.
Terms
- a(0) =1a(1) =8a(2) =57a(3) =386a(4) =2549a(5) =16612a(6) =107493a(7) =692854a(8) =4456201a(9) =28626368a(10) =183771057a(11) =1179304106a(12) =7566306749a(13) =48539073052a(14) =311365675293
External references
- oeis: A164031