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, -1, -1), (-1, 0, 0), (1, -1, 1), (1, 1, 0)}.
A148670
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, -1, -1), (-1, 0, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =62a(6) =201a(7) =605a(8) =2011a(9) =6502a(10) =22101a(11) =73668a(12) =254610a(13) =855688a(14) =2992543a(15) =10303873a(16) =36346419a(17) =126557708a(18) =449930313a(19) =1574917880a(20) =5634214960a(21) =19949390598a(22) =71696662513a(23) =255420242076a(24) =922281690320
External references
- oeis: A148670