64500domain: NAppears in sequencesNumber of 4 X n binary matrices with 1 unit column up to row and column permutations.at n=10A057222Successively larger 3-ball 'prime' ground-state site swaps of A084521 in concatenated decimal notation.at n=36A084522Number of (w,x,y,z) with all terms in {1,...,n} and w<2x+y+z.at n=16A212145