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, 0, 0), (-1, 0, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148208
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, 0, 0), (-1, 0, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =36a(6) =119a(7) =414a(8) =1479a(9) =5537a(10) =21110a(11) =82414a(12) =328172a(13) =1324138a(14) =5424088a(15) =22463127a(16) =93964925a(17) =396784531a(18) =1688187736a(19) =7235233930a(20) =31207515354a(21) =135369257264a(22) =590324574016
External references
- oeis: A148208