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), (-1, 1, 1), (1, -1, -1), (1, 1, 1)}.
A149531
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), (-1, 1, 1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =55a(5) =167a(6) =835a(7) =2857a(8) =14285a(9) =52561a(10) =262805a(11) =1013105a(12) =5065525a(13) =20180161a(14) =100900805a(15) =411873731a(16) =2059368655a(17) =8565364651a(18) =42826823255a(19) =180795858315a(20) =903979291575
External references
- oeis: A149531