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, 1), (-1, 1, -1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148359
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, 1), (-1, 1, -1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =45a(6) =155a(7) =542a(8) =1966a(9) =7466a(10) =28640a(11) =112818a(12) =452793a(13) =1838031a(14) =7579723a(15) =31599165a(16) =132977936a(17) =565343035a(18) =2421524022a(19) =10449677575a(20) =45409673570a(21) =198464619163a(22) =872445045025
External references
- oeis: A148359