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, 1), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
A148979
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, 1), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =112a(6) =416a(7) =1595a(8) =6274a(9) =25167a(10) =102555a(11) =423339a(12) =1768311a(13) =7458501a(14) =31731885a(15) =136027943a(16) =587011854a(17) =2548351515a(18) =11122561784a(19) =48780963600a(20) =214886096297a(21) =950408168978
External references
- oeis: A148979