111890

Appears in sequences

• The smallest pronic (A002378) that contains the digits of n in its exact middle.at n=18A163597
• Inverse of coefficient array of orthogonal polynomials P(n,x)=(x-2n+2)*P(n-1,x)-(2n-3)*P(n-2,x), P(0,x)=1, P(1,x)=x-1.at n=39A185997
• Number of ascent sequences of length n avoiding the pattern 0000.at n=10A317784