Triangle of numbers a(r,j) = j*(j+1) mod r+2, r>=1, j=1..r.

Terms

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