178090domain: NAppears in sequencesIndices of primes in the sequence defined by A(0) = 49, A(n) = 10*A(n-1) - 81 for n > 0.at n=15A101715Number of length 2+2 0..n arrays with the sum of the maximum minus the median of adjacent triples multiplied by some arrangement of +-1 equal to zero.at n=28A251936