Triangle read by rows: T(0,0) = 1; T(n,k) = - T(n-1,k) - 2 T(n-3,k-1) for k = 0..floor(n/3); T(n,k)=0 for n or k < 0.
A317505
Triangle read by rows: T(0,0) = 1; T(n,k) = - T(n-1,k) - 2 T(n-3,k-1) for k = 0..floor(n/3); T(n,k)=0 for n or k < 0.
Terms
- a(0) =1a(1) =-1a(2) =1a(3) =-1a(4) =2a(5) =1a(6) =-4a(7) =-1a(8) =6a(9) =1a(10) =-8a(11) =4a(12) =-1a(13) =10a(14) =-12a(15) =1a(16) =-12a(17) =24a(18) =-1a(19) =14a(20) =-40a(21) =8a(22) =1a(23) =-16a(24) =60a(25) =-32a(26) =-1a(27) =18a(28) =-84a(29) =80
External references
- oeis: A317505