288901

Appears in sequences

• Number of permutations avoiding the consecutive pattern 1234.at n=9A117158
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k triple descents (n>=0,0<=k<=n-3). We say that i is a triple descent of a permutation p if p(i) > p(i+1) > p(i+2) > p(i+3).at n=24A220183
• a(n) = n! * Sum_{k=0..n} binomial(n*k,n-k)/k!.at n=6A361281