83377domain: NAppears in sequencesNumber of 3 X n nonnegative integer matrices with all column sums 3, up to row and column permutation.at n=13A058407Total number of palindromic primes in base 2 below 2^n.at n=38A117772Total number of palindromic primes in base 2 below 2^n.at n=39A117772