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), (1, -1, 1), (1, 0, 0), (1, 0, 1), (1, 1, -1)}.
A150420
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), (1, -1, 1), (1, 0, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =24a(4) =95a(5) =381a(6) =1618a(7) =6947a(8) =30662a(9) =136573a(10) =618099a(11) =2818128a(12) =12981409a(13) =60152326a(14) =280713698a(15) =1316221777a(16) =6203507127a(17) =29349414927a(18) =139399848256a(19) =664156567450
External references
- oeis: A150420