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), (0, 1, 1), (1, 0, -1)}.
A148309
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), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =37a(6) =116a(7) =348a(8) =1116a(9) =3552a(10) =11828a(11) =38899a(12) =132095a(13) =446282a(14) =1539955a(15) =5291447a(16) =18493635a(17) =64442644a(18) =227297730a(19) =800666043a(20) =2846893015a(21) =10112423896a(22) =36188706519a(23) =129467264463a(24) =465824656435
External references
- oeis: A148309