Triangle read by rows: T(0,0)= 1; T(n,k)= T(n-1,k) + 5*T(n-2,k-1) for k = 0..floor(n/2); T(n,k)=0 for n or k < 0.
A305838
Triangle read by rows: T(0,0)= 1; T(n,k)= T(n-1,k) + 5*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) =1a(2) =1a(3) =5a(4) =1a(5) =10a(6) =1a(7) =15a(8) =25a(9) =1a(10) =20a(11) =75a(12) =1a(13) =25a(14) =150a(15) =125a(16) =1a(17) =30a(18) =250a(19) =500a(20) =1a(21) =35a(22) =375a(23) =1250a(24) =625a(25) =1a(26) =40a(27) =525a(28) =2500a(29) =3125
External references
- oeis: A305838