1062500

Appears in sequences

• Second-order Eulerian numbers <<n,3>>.at n=6A006260
• Second-order Eulerian triangle T(n,k), 1 <= k <= n.at n=39A008517
• Numbers that are the sum of 2 nonzero squares in exactly 7 ways.at n=20A025290
• Numbers that are the sum of 2 distinct nonzero squares in exactly 7 ways.at n=24A025308
• Coefficient triangle for polynomials used for o.g.f.s for unsigned Stirling1 diagonals.at n=41A112007
• Triangle related to the o.g.f.s. of the right-hand columns of A130534 (E(x,m=1,n)).at n=50A163936
• G.f.: 1/(1-5*x+10*x^3-5*x^4).at n=9A200781
• Number of 0..n arrays x(0..8) of 9 elements without any two consecutive increases.at n=3A200791
• Triangle of second-order Eulerian numbers T(n,k) (n>=0, 0 <= k <= n) read by rows.at n=48A201637
• Row reversed version of triangle A201637 (second-order Eulerian triangle).at n=51A288874
• Hypotenuses for which there exist exactly 19 distinct integer triangles.at n=13A290505
• E2(n, k), the second-order Eulerian numbers with E2(0, k) = δ_{0, k}. Triangle read by rows, E2(n, k) for 0 <= k <= n.at n=49A340556
• Numbers k such that the digits of k^2 are a subsequence of the digits of k^3.at n=27A362002
• G.f. A(x) satisfies A(x) = ( 1 + 25*x*A(x)^3 )^(1/5).at n=7A385204