Fitted 1-term 1S GTO first order density basis set (H-He)
Z=1 H [1s1] 2S
1
0.4047729970
Z=2 He [1s2] 1S
1.1301923376
Z=1 H [1s1] 2S Z=1 H [1s1] 2S Z=2 He [1s2] 1S 
