15600900

Appears in sequences

• a(n) = 3*binomial(2n-1,n).at n=12A003409
• Central elements of the (1,2)-Pascal triangle A029635.at n=13A029651
• a(0) = 1; for n > 0, a(n) = binomial(n, floor(n/2)) + binomial(n-1, floor(n/2)).at n=26A050168
• Number of nX1 0..2 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=37A200770