Expansion of critical exponent for walks on tetrahedral lattice.

Terms

a(0) =2a(1) =2a(2) =4a(3) =12a(4) =30a(5) =60a(6) =154a(7) =404a(8) =1046a(9) =2540a(10) =6720a(11) =17484a(12) =46522a(13) =120300a(14) =323800a(15) =856032a(16) =2315578a(17) =6151080a(18) =16745530a(19) =44921984a(20) =122790698a(21) =331148108a(22) =908909558a(23) =2465359580a(24) =6788313198a(25) =18491757632a(26) =51067082988