118586domain: NAppears in sequencesNumbers n such that n''' = n''+ 1 where n'' and n''' are respectively the second and the third arithmetic derivative of n.at n=27A189941Number T(n,k) of tilings of a 3k X n rectangle with right trominoes.at n=61A351322Number of tilings of a 6 X n rectangle with right trominoes.at n=12A351323