54223

Appears in sequences

• Strong pseudoprimes to base 35.at n=20A020261
• Strong pseudoprimes to base 62.at n=28A020288
• Triangle: T(n,k), k<=n: commutative groupoids with a nontrivial symmetry with n elements and k idempotents.at n=17A038023
• A064434(n) = 0.at n=10A064456
• Structured pentagonal hexacontahedral numbers (vertex structure 16).at n=12A100169
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either as two by three or three by two blocks.at n=15A146154
• Half the number of n X 4 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=6A185830
• Half the number of nX7 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=3A185833
• T(n,k)=Half the number of nXk binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=48A185835
• T(n,k)=Half the number of nXk binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=51A185835
• Number of parking functions of size n avoiding the patterns 312 and 321.at n=8A362744