229248

Appears in sequences

• G.f.: 1/(1-6*x+8*x^3).at n=7A111989
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k entries that are midpoints of 321 patterns (0 <= k <= n-2 for n >= 2; k=0 for n=1).at n=44A145879
• Penultimate diagonal of triangle in A145879.at n=7A182543
• Number of nX3 array permutations with each element moving one space diagonally, horizontally or vertically.at n=6A189349
• Number of nX7 array permutations with each element moving one space diagonally, horizontally or vertically.at n=2A189353
• T(n,k) is the number of n X k array permutations with each element moving one space diagonally, horizontally or vertically.at n=38A189355
• T(n,k) is the number of n X k array permutations with each element moving one space diagonally, horizontally or vertically.at n=42A189355
• Number of subsets of {2...n} containing every element of {2...n} whose prime indices all belong to the subset.at n=22A324737