Number of n-step walks (each step +-1 starting from 0) which are never more than 5 or less than -5.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =62a(7) =124a(8) =236a(9) =472a(10) =890a(11) =1780a(12) =3340a(13) =6680a(14) =12502a(15) =25004a(16) =46732a(17) =93464a(18) =174554a(19) =349108a(20) =651740a(21) =1303480a(22) =2432918a(23) =4865836a(24) =9080956a(25) =18161912a(26) =33892954a(27) =67785908a(28) =126494956a(29) =252989912