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, 0, -1), (1, 1, -1), (1, 1, 1)}.
A149678
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, 0, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =247a(6) =1099a(7) =4455a(8) =19465a(9) =81113a(10) =366871a(11) =1581857a(12) =7124697a(13) =31095533a(14) =142367227a(15) =632488035a(16) =2891693583a(17) =12932761935a(18) =59700835301a(19) =269914718735
External references
- oeis: A149678