Triangle T(n,k) = 3*T(n-1,k) + T(n-2,k-1) for k = 0..floor(n/2), with T(0,0) = 1 and T(n,k) = 0 for n < 0 or k < 0, read by rows.
A304249
Triangle T(n,k) = 3*T(n-1,k) + T(n-2,k-1) for k = 0..floor(n/2), with T(0,0) = 1 and T(n,k) = 0 for n < 0 or k < 0, read by rows.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =1a(4) =27a(5) =6a(6) =81a(7) =27a(8) =1a(9) =243a(10) =108a(11) =9a(12) =729a(13) =405a(14) =54a(15) =1a(16) =2187a(17) =1458a(18) =270a(19) =12a(20) =6561a(21) =5103a(22) =1215a(23) =90a(24) =1a(25) =19683a(26) =17496a(27) =5103a(28) =540a(29) =15
External references
- oeis: A304249