a(n) is the index of the last occurrence of the n-th distinct term (equal to n+1) in sequence A155934(m) = k(m) = the least integer such that every m X m (0,1)-matrix with exactly k(m) ones in each row and in each column contains a 2 X 2 submatrix without zeros.

A005991

a(n) is the index of the last occurrence of the n-th distinct term (equal to n+1) in sequence A155934(m) = k(m) = the least integer such that every m X m (0,1)-matrix with exactly k(m) ones in each row and in each column contains a 2 X 2 submatrix without zeros.