Triangle read by rows: T(0,0) = 1; T(n,k) = 5*T(n-1,k) + T(n-2,k-1) for k = 0..floor(n/2); T(n,k)=0 for n or k < 0.

A305837

Triangle read by rows: T(0,0) = 1; T(n,k) = 5*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) =5a(2) =25a(3) =1a(4) =125a(5) =10a(6) =625a(7) =75a(8) =1a(9) =3125a(10) =500a(11) =15a(12) =15625a(13) =3125a(14) =150a(15) =1a(16) =78125a(17) =18750a(18) =1250a(19) =20a(20) =390625a(21) =109375a(22) =9375a(23) =250a(24) =1a(25) =1953125a(26) =625000a(27) =65625a(28) =2500a(29) =25

External references