31142

Appears in sequences

• Ratio from A049102.at n=47A049106
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-1000 pattern in any orientation.at n=10A146414
• Principal diagonal of the convolution array A213836.at n=22A213837
• Numbers that are equal to the sum of the number of divisors of their first k arithmetic derivatives, for some k.at n=36A269459
• E.g.f. satisfies: log(A(x)) = exp(x*A(x)^2) - 1.at n=5A349598