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, 1, -1), (-1, 1, 1), (0, 0, 1), (1, 0, 0)}.
A149940
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, 1, -1), (-1, 1, 1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =170a(6) =619a(7) =2316a(8) =8807a(9) =34064a(10) =133999a(11) =533104a(12) =2138252a(13) =8645140a(14) =35208465a(15) =144247477a(16) =594033854a(17) =2457732830a(18) =10209721069a(19) =42566281522a(20) =178065201645a(21) =747148601038
External references
- oeis: A149940