23019

Appears in sequences

• Numbers whose square is a zeroless pandigital number (i.e., use the digits 1 through 9 once).at n=13A071519
• Triangle read by rows: T(n,k) = n*T(n-1,k) + n - k starting at T(n,n)=0.at n=48A081114
• Numbers n such that n contains exactly 5 digits, all distinct, and n^2 contains exactly 9 distinct digits.at n=18A204691
• Number of -1..1 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one or three distinct values for every i<=n and j<=n.at n=11A211476
• E.g.f. satisfies: A'(x) = A(x)^4 * A(-x) with A(0) = 1.at n=6A235322
• Number of partitions p of n such that (maximal multiplicity of the parts of p) < (number of distinct parts of p).at n=42A240305
• Numbers whose square contains all of the digits 1 through 9.at n=13A294661
• Number of weakly unimodal compositions of n in which the greatest part occurs exactly seven times.at n=56A320318
• Expansion of Product_{k>=1} (1-q^(2*k))/(1-q^k)^4.at n=12A350642