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, 0), (-1, 0, 1), (-1, 1, 1), (0, 1, -1), (1, 0, 0)}.
A148705
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, 0), (-1, 0, 1), (-1, 1, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =74a(6) =250a(7) =896a(8) =3216a(9) =11970a(10) =45118a(11) =172339a(12) =668019a(13) =2611405a(14) =10304201a(15) =40996002a(16) =164121773a(17) =661305741a(18) =2678915088a(19) =10903798400a(20) =44583248139a(21) =183006868153a(22) =753955760694
External references
- oeis: A148705