26528

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 81.at n=38A031579
• Numerators of partial sums of series for 3*arctanh(1/3) = (3/2)*log(2).at n=3A096949
• Number of ways to place 3 nonattacking nightriders on a 3 X n board.at n=19A172218
• Number of (n+2)X5 binary arrays avoiding patterns 000 and 101 in rows and columns.at n=3A203086
• Number of (n+2)X6 binary arrays avoiding patterns 000 and 101 in rows and columns.at n=2A203087
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 000 and 101 in rows and columns.at n=17A203091
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 000 and 101 in rows and columns.at n=18A203091
• Number of (n+6)X(n+6) 0..1 matrices with each 7X7 subblock idempotent.at n=3A224580
• Number of (n+6)X10 0..1 matrices with each 7X7 subblock idempotent.at n=3A224584
• T(n,k)=Number of (n+6)X(k+6) 0..1 matrices with each 7X7 subblock idempotent.at n=24A224588
• Number of nondecreasing -n..n vectors of length 3 whose dot product with some lexicographically greater than or equal to nondecreasing -n..n vector equals 3.at n=29A226424
• a(n) = A152392(n)/n for n>=1.at n=7A266332
• Number of nX6 0..1 arrays with every element unequal to 0, 1, 2, 3 or 8 king-move adjacent elements, with upper left element zero.at n=6A305228
• Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 3 or 8 king-move adjacent elements, with upper left element zero.at n=5A305229