21721

Appears in sequences

• Number of configurations of the sliding block 8-puzzle that require a minimum of n moves to be reached, starting with the empty square at mid-side.at n=21A089483
• Theorems from propositional calculus, translated into decimal digits.at n=34A101273
• Numbers n such that Maple 9.5, Maple 10, Maple 11 and Maple 12 give the wrong answers for the number of partitions of n.at n=19A110375
• Number of partitions p of n such that the number of parts having multiplicity 1 is a part or max(p) - min(p) is a part.at n=39A241451
• a(n) = 24*n^2 + 52*n + 29.at n=29A258721
• Expansion of 1/(1 - 4*x - x^2 + x^3).at n=7A364705