141578

Appears in sequences

• Number of 2 X 2 matrices having all terms in {1,...,n} and positive even determinant.at n=25A211067
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8.at n=18A252008
• Distinct values of A343511.at n=10A341337
• a(n) = 1 + Sum_{d|n, d < n} a(d)^2.at n=59A343511