a(2*n+2) = 7*a(2*n+1), a(2*n+1) = 7*a(2*n) - 6^n*A000108(n), a(0) = 1.
A156361
a(2*n+2) = 7*a(2*n+1), a(2*n+1) = 7*a(2*n) - 6^n*A000108(n), a(0) = 1.
Terms
- a(0) =1a(1) =6a(2) =42a(3) =288a(4) =2016a(5) =14040a(6) =98280a(7) =686880a(8) =4808160a(9) =33638976a(10) =235472832a(11) =1647983232a(12) =11535882624a(13) =80745019776a(14) =565215138432
External references
- oeis: A156361