a(n) = ((1+4*sqrt(2))*(4+2*sqrt(2))^n + (1-4*sqrt(2))*(4-2*sqrt(2))^n)/2.
A164605
a(n) = ((1+4*sqrt(2))*(4+2*sqrt(2))^n + (1-4*sqrt(2))*(4-2*sqrt(2))^n)/2.
Terms
- a(0) =1a(1) =20a(2) =152a(3) =1056a(4) =7232a(5) =49408a(6) =337408a(7) =2304000a(8) =15732736a(9) =107429888a(10) =733577216a(11) =5009178624a(12) =34204811264a(13) =233565061120
External references
- oeis: A164605