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, 0), (-1, 1, -1), (0, 1, 1), (1, -1, -1)}.
A148215
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, 0), (-1, 1, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =31a(6) =89a(7) =283a(8) =869a(9) =2669a(10) =8870a(11) =29810a(12) =98119a(13) =333199a(14) =1177914a(15) =4047033a(16) =14102749a(17) =50959995a(18) =181208819a(19) =644899622a(20) =2360104239a(21) =8605418138a(22) =31204155230a(23) =115179384007a(24) =427767584786
External references
- oeis: A148215