Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 0), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.
A150572
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 0), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =108a(5) =458a(6) =2015a(7) =8998a(8) =40910a(9) =188085a(10) =873480a(11) =4088071a(12) =19255234a(13) =91196085a(14) =433874641a(15) =2072559697a(16) =9933966308a(17) =47758780547a(18) =230210936267
External references
- oeis: A150572