105002

Appears in sequences

• Number of key permutations of length n: permutations {a_i} with |a_i - a_{i-1}| = 1 or 2.at n=26A003274
• Irregular table read by rows, T(n, k) is the rank of the k-th Genocchi permutation of {1,...,n}, permutations sorted in lexicographical order. If no Genocchi permutation of {1,...,n} exists, then T(n, 1) = 0 by convention.at n=32A347599