diff --git a/ho_basis.jl b/ho_basis.jl
index ce9968e..de9f2f3 100644
--- a/ho_basis.jl
+++ b/ho_basis.jl
@@ -5,9 +5,9 @@ include("helper.jl")
 # Gaussian potentials in HO space
 inv_factorial(n) = Iterators.prod(inv.(1:n))
 sqrt_factorial(n) = Iterators.prod(sqrt.(n:-1:1))
-N_lnk(l, n, k) = (-1)^(n-k) * inv_factorial(k) * binomial(n+l+1/2, n-k) * sqrt_factorial(n) / sqrt(gamma(n+l+3/2))
-Talmi(l, R, k1, k2) = (1 + 1/R^2)^-(3/2 + l + k1 + k2) * gamma(3/2 + l + k1 + k2)
-V_Gaussian(R, l, n1, n2) = better_sum([N_lnk(l, n1, k1) * N_lnk(l, n2, k2) * Talmi(l, R, k1, k2) for (k1, k2) in Iterators.product(0:n1, 0:n2)])
+N_lnk(l, n, k) = 1/sqrt_factorial(n) * binomial(n, k) * sqrt(gamma(n + l + 3/2)) / gamma(k + l + 3/2)
+Talmi(l, R, k1, k2) = (-1)^(k1 + k2) * (1 + 1/R^2)^-(3/2 + l + k1 + k2) * gamma(3/2 + l + k1 + k2)
+V_Gaussian(R, l, n1, n2) = (-1)^(n1 + n2) * better_sum([N_lnk(l, n1, k1) * N_lnk(l, n2, k2) * Talmi(l, R, k1, k2) for (k1, k2) in Iterators.product(0:n1, 0:n2)])
 
 function get_sp_basis(E_max)
     Es = Int[]