394471domain: NAppears in sequencesNumber of arrays of 5 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.at n=26A201813Numbers X such that X^2 + Y^2 = 3^(2*k) + 1 and X > Y > 0 and k is the ternary digit length of X-1.at n=27A369768