5531904

Appears in sequences

• Number of (n+2)X5 binary arrays avoiding patterns 001 and 011 in rows and columns.at n=9A202095
• Cyclic quadrilateral numbers: numbers m = a*b*c*d such that the integers a,b,c,d are the sides of a cyclic quadrilateral whose area and circumradius are integers.at n=16A218431
• Number of (n+1)X(4+1) 0..1 arrays with nondecreasing sum of every two consecutive values in every row and column.at n=10A250428
• Magic sums of 3 X 3 semimagic squares of squares whose rows, columns, and at least one of the two main diagonals sum to the same number.at n=21A271021
• The second Jordan totient function applied to the cubefull numbers: a(n) = A007434(A036966(n)).at n=31A379718