Triangle T00, T10, T01, T20, T11, T02, etc., where Tmn = number of distinct products ij with min(m,n) <= i,j <= max(m,n).

A027420

Triangle T00, T10, T01, T20, T11, T02, etc., where Tmn = number of distinct products ij with min(m,n) <= i,j <= max(m,n).

Terms

    a(0) =1a(1) =2a(2) =2a(3) =4a(4) =1a(5) =4a(6) =7a(7) =3a(8) =3a(9) =7a(10) =10a(11) =6a(12) =1a(13) =6a(14) =10a(15) =15a(16) =9a(17) =3a(18) =3a(19) =9a(20) =15a(21) =19a(22) =14a(23) =6a(24) =1a(25) =6a(26) =14a(27) =19a(28) =26a(29) =18

External references