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), (1, 0, 0), (1, 1, -1)}.
A148203
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), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =34a(6) =117a(7) =385a(8) =1432a(9) =5160a(10) =20168a(11) =77045a(12) =311677a(13) =1239448a(14) =5140477a(15) =21049400a(16) =88974654a(17) =372438423a(18) =1597803426a(19) =6803880625a(20) =29540393405a(21) =127517380748a(22) =559088380312
External references
- oeis: A148203