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, 0), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
A149938
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, 0), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =168a(6) =608a(7) =2300a(8) =8924a(9) =35440a(10) =144058a(11) =595413a(12) =2493996a(13) =10587961a(14) =45467314a(15) =197028767a(16) =861179094a(17) =3794348630a(18) =16830451472a(19) =75106043179a(20) =337098044697
External references
- oeis: A149938