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), (0, 0, 1), (0, 1, 0), (0, 1, 1), (1, 0, 0)}.
A151242
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), (0, 0, 1), (0, 1, 0), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =66a(4) =288a(5) =1298a(6) =5928a(7) =27390a(8) =128082a(9) =603852a(10) =2862322a(11) =13638202a(12) =65286884a(13) =313627614a(14) =1510990514a(15) =7299643480a(16) =35348690964a(17) =171512134246a(18) =833651714848
External references
- oeis: A151242