548864

Appears in sequences

• a(n)=(-1)^(n+1)*det(M(n)) where M(n) is the n X n matrix M(i,j)=min(abs(i-j),i).at n=18A080692
• Triangle T, read by rows, where column 0 of T^m = {C(m*2^n, n), n>=0} for all m.at n=25A136470
• a(n) = number of n-lettered words in the alphabet {1, 2, 3, 4} with as many occurrences of the substring (consecutive subword) [1, 2] as of [2, 1].at n=10A211307
• Number of tilings of a 5 X 2n rectangle using 2n pentominoes of shapes P, U.at n=9A247121
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 331", based on the 5-celled von Neumann neighborhood.at n=26A281179
• Smallest number k that cannot be expressed as x^2 + y^2 + z^2 + w^2 where x >= y >= z >= w >= 0 and x > floor(sqrt(k)) - n, but can be so expressed if x = floor(sqrt(k)) - n.at n=35A285552
• Numbers n for which A019565(n) <= A087207(n) < n.at n=40A286612