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), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148933
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), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =28a(5) =99a(6) =356a(7) =1328a(8) =5097a(9) =19960a(10) =79422a(11) =320690a(12) =1310179a(13) =5406116a(14) =22506438a(15) =94405329a(16) =398676354a(17) =1693626888a(18) =7233208542a(19) =31039546830a(20) =133775260725a(21) =578814117990
External references
- oeis: A148933