Triangle T(n,k) read by rows: T(n,n) = -1, T(n,0) = 3^(n - 1), T(n,k) = -3^(n - k - 1), 1 <= k <= n - 1.
A152570
Triangle T(n,k) read by rows: T(n,n) = -1, T(n,0) = 3^(n - 1), T(n,k) = -3^(n - k - 1), 1 <= k <= n - 1.
Terms
- a(0) =-1a(1) =1a(2) =-1a(3) =3a(4) =-1a(5) =-1a(6) =9a(7) =-3a(8) =-1a(9) =-1a(10) =27a(11) =-9a(12) =-3a(13) =-1a(14) =-1a(15) =81a(16) =-27a(17) =-9a(18) =-3a(19) =-1a(20) =-1a(21) =243a(22) =-81a(23) =-27a(24) =-9a(25) =-3a(26) =-1a(27) =-1a(28) =729a(29) =-243
External references
- oeis: A152570