283893domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(780).at n=6A042504Number of arrangements of n+1 numbers x(i) in -8..8 with the sum of x(i)*x(i+1) equal to zero.at n=4A188357Number of arrangements of 6 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.at n=7A188361