108281domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(153).at n=9A041280Numerators of continued fraction convergents to sqrt(612).at n=9A042174Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 5,1,2,2,1,2,0 for x=0,1,2,3,4,5,6.at n=5A197741