Triangle read by rows: T(0,0) = 1; T(n,k) = 9*T(n-1,k) + T(n-2,k-1) for k = 0..floor(n/2); T(n,k)=0 for n or k < 0.
A317052
Triangle read by rows: T(0,0) = 1; T(n,k) = 9*T(n-1,k) + T(n-2,k-1) for k = 0..floor(n/2); T(n,k)=0 for n or k < 0.
Terms
- a(0) =1a(1) =9a(2) =81a(3) =1a(4) =729a(5) =18a(6) =6561a(7) =243a(8) =1a(9) =59049a(10) =2916a(11) =27a(12) =531441a(13) =32805a(14) =486a(15) =1a(16) =4782969a(17) =354294a(18) =7290a(19) =36a(20) =43046721a(21) =3720087a(22) =98415a(23) =810a(24) =1a(25) =387420489a(26) =38263752a(27) =1240029a(28) =14580a(29) =45
External references
- oeis: A317052