Triangle read by rows: T(0,0)=1; T(n,k) = T(n-1,k)-2*T(n-2,k-1)+2*T(n-3,k-2) for k = 0..floor(2*n/3); T(n,k)=0 for n or k < 0.

A304223

Triangle read by rows: T(0,0)=1; T(n,k) = T(n-1,k)-2*T(n-2,k-1)+2*T(n-3,k-2) for k = 0..floor(2*n/3); T(n,k)=0 for n or k < 0.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =-2a(4) =1a(5) =-4a(6) =2a(7) =1a(8) =-6a(9) =8a(10) =1a(11) =-8a(12) =18a(13) =-8a(14) =1a(15) =-10a(16) =32a(17) =-32a(18) =4a(19) =1a(20) =-12a(21) =50a(22) =-80a(23) =36a(24) =1a(25) =-14a(26) =72a(27) =-160a(28) =136a(29) =-24

External references