Triangle, read by rows, where the g.f. of row n equals Product_{k=0..n-1} (1 + k*y + y^2) for n>0 with a single '1' in row 0.
A201949
Triangle, read by rows, where the g.f. of row n equals Product_{k=0..n-1} (1 + k*y + y^2) for n>0 with a single '1' in row 0.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =1a(6) =2a(7) =1a(8) =1a(9) =1a(10) =3a(11) =5a(12) =6a(13) =5a(14) =3a(15) =1a(16) =1a(17) =6a(18) =15a(19) =24a(20) =28a(21) =24a(22) =15a(23) =6a(24) =1a(25) =1a(26) =10a(27) =40a(28) =90a(29) =139
External references
- oeis: A201949