Triangle read by rows. The definition is by diagonals. The r-th diagonal from the right, for r >= 0, is given by b(0) = b(1) = 1; b(n+1) = Sum_{k=0..n} binomial(n+2,k+r)*a(k).
A121207
Triangle read by rows. The definition is by diagonals. The r-th diagonal from the right, for r >= 0, is given by b(0) = b(1) = 1; b(n+1) = Sum_{k=0..n} binomial(n+2,k+r)*a(k).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =1a(7) =1a(8) =3a(9) =5a(10) =1a(11) =1a(12) =4a(13) =9a(14) =15a(15) =1a(16) =1a(17) =5a(18) =14a(19) =31a(20) =52a(21) =1a(22) =1a(23) =6a(24) =20a(25) =54a(26) =121a(27) =203a(28) =1a(29) =1
External references
- oeis: A121207