1239552

Appears in sequences

• Number of fair sudoku problems with n given values on a 4 x 4 grid.at n=11A109252
• Value of T[4] after the n-th iteration, when the map T is initialized with T[1] = 1 and in subsequent iterations, T[v] = k + (T[v] if defined else 0) for all key-value pairs (k, v) in T; a(n) = 0 if T[4] isn't defined yet.at n=24A390944