51312

Appears in sequences

• a(n) = floor(C(4n,2n)/C(4n,n)).at n=21A024501
• Sum of divisors of Woodall (or Riesel) numbers; sigma(A003261(n)); sigma(n*2^n - 1).at n=11A063515
• Sequence of coefficients of x in marked mesh pattern generating function Q_{n,132}^(-,0,3,0)(x).at n=7A212349
• Number of (n+1)X(2+1) 0..1 arrays x(i,j) with row sums sum{j^3*x(i,j), j=1..2+1} nondecreasing, and column sums sum{i^3*x(i,j), i=1..n+1} nondecreasing.at n=12A232855
• Least positive integer m with prime(m)+2 and prime(prime(m))+2 both prime such that prime(m*n)+2 and prime(prime(m*n))+2 are both prime.at n=4A259487