18737

Appears in sequences

• Integer part of ((4th elementary symmetric function of 1,2,..,n)/(2nd elementary symmetric function of 1,2,...,n)).at n=30A024173
• Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026692.at n=12A026701
• Number of partitions satisfying cn(2,5) + cn(3,5) <= cn(0,5) + cn(1,5) + cn(4,5).at n=37A039867
• Numerators of continued fraction convergents to sqrt(73).at n=8A041128
• Numerators of continued fraction convergents to sqrt(657).at n=10A042262
• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 17.at n=25A051982
• Triangle read by rows: T(n,k) (n,k>=0) = number of peakless Motzkin paths of length n having k valleys (i.e., (1,-1) followed by (1,1)) at level zero (can be easily translated into RNA secondary structure terminology).at n=39A110333
• Indices of prime Padovan numbers: values of k such that A000931(k+5) is prime.at n=23A112882
• Indices n such that the 3 X 3 matrix with components (row by row) prime(n+k), 0 <= k <= 8, has zero determinant.at n=26A117345
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.at n=10A148354
• Quartan semiprimes: semiprimes of the form x^4 + y^4, x>0, y>0.at n=14A182277
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+84847)^2 = y^2.at n=13A201917
• Number of partitions of n whose median is not a part.at n=45A238479
• Number of length n+4 0..6 arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two.at n=5A248985
• Number of length 6+4 0..n arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two.at n=5A248993
• Number of (n+1) X (3+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=15A250724
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 393", based on the 5-celled von Neumann neighborhood.at n=32A271604
• Numbers that are, at the same time, the sum of: two positive squares, a positive square and a positive cube, and two positive cubes. In other words, intersection of A000404, A003325 and A055394.at n=36A273498