21477

Appears in sequences

• Numerators of continued fraction convergents to sqrt(780).at n=4A042504
• Number of irreducible representations of symmetric group S_n for which every matrix has determinant 1.at n=36A045923
• G.f. satisfies: A(x) = Sum_{n>=0} n!*x^n*A(x)^n.at n=7A088368
• Numbers k such that 216*k+108 is a term of A097703 and A007494 and A098240.at n=20A098241
• Augmentation of the triangular array P given by p(n,k)=k! for 0<=k<=n. See Comments.at n=35A193092
• Triangle T(n,k), n>=1, 0<=k<=n*(n+1)/2, read by rows: row n gives the coefficients of the chromatic polynomial of the n X n X n triangular grid, highest powers first.at n=28A193283
• Numbers whose binary and dual Zeckendorf representations are both palindromic.at n=8A331193
• Integers which can be written in exactly three ways as sum of two distinct nonzero pentagonal numbers.at n=20A333013
• Binary palindromic numbers whose digit sum and aliquot sum are also binary palindromic.at n=13A363965