532899domain: NAppears in sequencesNumber of (n+1) X (2+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits.at n=12A262326a(n) is the smallest number m with n divisors such that m+1 has n-1 divisors, or 0 if no such number exists.at n=27A353032