Triangle read by rows: T(0,0) = 1; T(n,k) = 3 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.
A317502
Triangle read by rows: T(0,0) = 1; T(n,k) = 3 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) =3a(2) =9a(3) =27a(4) =-2a(5) =81a(6) =-12a(7) =243a(8) =-54a(9) =729a(10) =-216a(11) =4a(12) =2187a(13) =-810a(14) =36a(15) =6561a(16) =-2916a(17) =216a(18) =19683a(19) =-10206a(20) =1080a(21) =-8a(22) =59049a(23) =-34992a(24) =4860a(25) =-96a(26) =177147a(27) =-118098a(28) =20412a(29) =-720
External references
- oeis: A317502