93210domain: NAppears in sequencesPeriod of the n-th convergent to the continued fraction expansion of Pi.at n=12A236250Number of length 3+2 0..n arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero.at n=14A250562a(n) = Sum_{k=0..n} binomial(3*n+1,k) * binomial(3*n-k-1,n-k).at n=5A386833