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, 1, 0), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
A148252
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, 1, 0), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =36a(6) =128a(7) =422a(8) =1639a(9) =5949a(10) =24113a(11) =93309a(12) =391828a(13) =1583365a(14) =6804543a(15) =28395349a(16) =124390258a(17) =531687409a(18) =2362484441a(19) =10291265724a(20) =46279573814a(21) =204646979728a(22) =929108004632
External references
- oeis: A148252