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, 0, 0), (0, -1, 1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
A148952
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, 0, 0), (0, -1, 1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =103a(6) =377a(7) =1422a(8) =5565a(9) =21950a(10) =88820a(11) =363147a(12) =1507396a(13) =6318361a(14) =26732683a(15) =114043135a(16) =489990808a(17) =2119013654a(18) =9217370077a(19) =40299682605a(20) =177044960066a(21) =781085989055
External references
- oeis: A148952