81802

Appears in sequences

• Triangle T, read by rows, that satisfies: T(n,k) = [T^2](n-1,k) for n>k+1>=1, with T(n,n) = 1 and T(n+1,n) = n+1 for n>=0, where T^2 is the matrix square of T.at n=45A109152
• Column 0 of triangle A109152.at n=9A109153
• Triangle read by rows: T(n, k) is the number of k-dimensional subspaces in (F_5)^n, counted up to coordinate permutation (n >= 0, 0 <= k <= n).at n=47A347972
• Triangle read by rows: T(n, k) is the number of k-dimensional subspaces in (F_5)^n, counted up to coordinate permutation (n >= 0, 0 <= k <= n).at n=52A347972
• Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1.at n=40A368702
• G.f. A(x) satisfies a(n) = [x^n] ( A(x)^(n-1) - 2*A(x)^n + A(x)^(n+1) ) for n > 1, with a(0) = a(1) = 1.at n=8A384264