Expansion of critical exponent for walks on tetrahedral lattice.

Terms

a(0) =3a(1) =7a(2) =19a(3) =53a(4) =147a(5) =401a(6) =1123a(7) =3137a(8) =8793a(9) =24599a(10) =69287a(11) =194967a(12) =550361a(13) =1552645a(14) =4393021a(15) =12425121a(16) =35213027a(17) =99771855a(18) =283162701a(19) =803538483a(20) =2283184527a(21) =6486977223a(22) =18450767769a(23) =52477038631a(24) =149387309235a(25) =425257329235