90018

Appears in sequences

• G.f.: 1 = Sum_{n>=0} a(n)*x^n*(1-x)^(n+1)/(1 + (n+1)*x)^(2*n+1).at n=5A210097
• Number of n X 1 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=10A223188
• Numbers n such that A = n - digitsum(n) is divisible by the largest power of 10 <= A.at n=47A242474
• Smallest m such that A259043(m) = n.at n=52A259046