50449domain: NAppears in sequencesExpansion of 1/((1-3x)(1-6x)(1-7x)(1-8x)).at n=4A028074Indices of primes at which the prime race 4k-1 vs. 4k+1 is tied.at n=28A038691Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only either as two by three or three by two blocks.at n=15A146158