40285

Appears in sequences

• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=5.at n=30A143448
• Number of binary strings of length n with equal numbers of 0000 and 0011 substrings.at n=17A164149
• Triangle read by rows: number of permutation trees of power n and height <= k + 1.at n=34A179455
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} whose shortest block is of length k (1 <= k <= n). A block of a permutation is a maximal sequence of consecutive integers which appear in consecutive positions. For example, the permutation 4512367 has 3 blocks: 45, 123, and 67. Its shortest block has length 2.at n=28A184180
• Number of permutations of {1,2,...,n} whose shortest block is of length 1. A block of a permutation is a maximal sequence of consecutive integers which appear in consecutive positions. For example, the permutation 5412367 has 4 blocks: 5, 4, 123, and 67. Its shortest block has length 1.at n=8A184181