49539

Appears in sequences

• Row sums of triangle A130585.at n=13A130586
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.at n=21A146905
• O.g.f.: Sum_{n>=0} n!^2 * x^n * Product_{k=1..n} (1 + x) / (1 + k^2*x + k^2*x^2).at n=6A221371
• G.f. satisfies: A(x) = (1+x+x^2) * A(x^2)^2.at n=41A237651
• "Primitive" numbers k such that k divides 4^k - 1.at n=24A323203
• Number of ways to write n as an ordered sum of 7 nonprime numbers.at n=34A341484
• Number of subsets of Z_n such that every ordered pair of distinct elements has a different difference.at n=34A382399