Triangle T(n,k) = 3*T(n-1,k) + T(n-3,k-1) for k = 0..floor(n/3) with T(0,0) = 1 and T(n,k) = 0 for n or k < 0, read by rows.
A317497
Triangle T(n,k) = 3*T(n-1,k) + T(n-3,k-1) for k = 0..floor(n/3) with T(0,0) = 1 and T(n,k) = 0 for n or k < 0, read by rows.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =27a(4) =1a(5) =81a(6) =6a(7) =243a(8) =27a(9) =729a(10) =108a(11) =1a(12) =2187a(13) =405a(14) =9a(15) =6561a(16) =1458a(17) =54a(18) =19683a(19) =5103a(20) =270a(21) =1a(22) =59049a(23) =17496a(24) =1215a(25) =12a(26) =177147a(27) =59049a(28) =5103a(29) =90
External references
- oeis: A317497