27145

Appears in sequences

• Third row of Pascal-(1,5,1) array A081580.at n=39A081589
• Number of ways that a 1 X n rectangular tile T, marked into n unit squares, can be surrounded by one layer of copies of itself laid in the plane grid generated by the units of T. Ways that differ by rotation or reflection are not counted as different. The surrounded tile is the exact surrounded region.at n=18A159294
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} whose longest block is of length k (0<=k<=n).at n=59A184182
• Number of squares between powers of 2, floor(sqrt(2^(n+1))) - floor(sqrt(2^n)).at n=33A190568
• Number of 3 X 3 X 3 triangular 0..n arrays with every horizontal row nondecreasing and having the same average value.at n=31A214907
• Number of ways to reciprocally link elements of an 2 X n array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.at n=11A220739
• Relative offsets from the middle point of each row of A233271 & A218616 to the first point where the former exceeds the latter, which apart of case a(3)=-1 is always left of or at the middle point.at n=24A233274
• a(n) = 32*n^2 - 56*n + 25.at n=30A272129
• Squarefree terms of A276655.at n=29A276756
• Triangle read by rows: Ranks of ideals in Partial Brauer Monoid PB_n.at n=56A276774
• Centered square numbers which are sphenic numbers.at n=13A380882