40278

Appears in sequences

• Number of rooted identity trees with n nodes and 3 leaves.at n=34A055328
• Numbers k such that the k-th triangular number contains only digits {1,7,8}.at n=11A119147
• Triangle T(n, k) = 2*(n+1 - mod(n, k+1) - mod(n, n-k+1) ) + (n! - k! - (n-k)!) read by rows.at n=40A176151
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and 2w+x+y>2.at n=22A211619
• a(n) = Sum_{k=0..n} binomial(5*k,n-k) * Catalan(k).at n=7A360083