Triangle T00, T10, T11, T20, T21, T22, etc. where Tmn = number of distinct products ij with m-n<=i,j<=m.
A027422
Triangle T00, T10, T11, T20, T21, T22, etc. where Tmn = number of distinct products ij with m-n<=i,j<=m.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =4a(6) =1a(7) =3a(8) =6a(9) =7a(10) =1a(11) =3a(12) =6a(13) =9a(14) =10a(15) =1a(16) =3a(17) =6a(18) =10a(19) =14a(20) =15a(21) =1a(22) =3a(23) =6a(24) =10a(25) =14a(26) =18a(27) =19a(28) =1a(29) =3
External references
- oeis: A027422