Triangle read by rows: T(0,0) = 1; T(n,k) = 10*T(n-1,k) + T(n-2,k-1) for k = 0..floor(n/2); T(n,k)=0 for n or k < 0.
A317055
Triangle read by rows: T(0,0) = 1; T(n,k) = 10*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) =10a(2) =100a(3) =1a(4) =1000a(5) =20a(6) =10000a(7) =300a(8) =1a(9) =100000a(10) =4000a(11) =30a(12) =1000000a(13) =50000a(14) =600a(15) =1a(16) =10000000a(17) =600000a(18) =10000a(19) =40a(20) =100000000a(21) =7000000a(22) =150000a(23) =1000a(24) =1a(25) =1000000000a(26) =80000000a(27) =2100000a(28) =20000a(29) =50
External references
- oeis: A317055