I don't know if y'all know this or not, but some cells are repeated.

Usually in cells, when the first two "x"s are added together, they equal 2n.

eg. for cell (1,17), 1 and 17 being respectively (e,n), the first two "x"s are 13 & 21.

13 + 21 = 34 = 2*17 = 2n.

But some cells, like (1,65), the first two xs are 47 & 57.

47 + 57 = 104 /= 2n.

This is because the cell is repeated. the first x should be added with the fourth x, the second with the third. Example below for cell (1,65)

x1 + x4 = 47 + 83 = 130 = 2n.

x2 + x3 = 57 + 73 = 130 = 2n.

Ns existing in row 1 are of sequenc "A020882" in oeis, notice the 65 is repeated.

https://oeis.org/A020882