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, 1), (0, 1, -1), (1, 0, 0)}.
A148161
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, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =31a(6) =86a(7) =262a(8) =787a(9) =2442a(10) =7677a(11) =24581a(12) =80379a(13) =261809a(14) =867313a(15) =2890472a(16) =9684442a(17) =32683354a(18) =110898717a(19) =379064856a(20) =1297810439a(21) =4466393711a(22) =15433476163a(23) =53483388756a(24) =185962286216a(25) =648576840593
External references
- oeis: A148161