A087476 Triangle read by rows where the n-th row has n terms: T(n,i)=(i+2)^2-4 mod n.

0, 1, 0, 2, 0, 0, 1, 0, 1, 0, 0, 2, 1, 2, 0, 5, 0, 3, 2, 3, 0, 5, 5, 0, 4, 3, 4, 0, 5, 4, 5, 0, 5, 4, 5, 0, 5, 3, 3, 5, 0, 6, 5, 6, 0, 5, 2, 1, 2, 5, 0, 7, 6, 7, 0, 5, 1, 10, 10, 1, 5, 0, 8, 7, 8, 0, 5, 0, 9, 8, 9, 0, 5, 0, 9, 8, 9, 0, 5, 12, 8, 6, 6, 8, 12, 5, 0, 10, 9, 10, 0, 5, 12, 7, 4, 3, 4, 7, 12, 5, 0