313506312192domain: NAppears in sequencesDifference between the square root of n-th square triangular number and n-th lambda number given by the recurrence f(n) = 2f(n-1) + f(n-2), f(1) = 1, f(2)= 2.at n=15A113450Values y of solutions (x, y) to the Diophantine equation (x-y)^4 - 8*x*y = 0 with x >= y.at n=8A123116