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, 0, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148406
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, 0, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =52a(6) =178a(7) =641a(8) =2403a(9) =8988a(10) =34682a(11) =136929a(12) =549249a(13) =2208591a(14) =9016463a(15) =37266518a(16) =155368761a(17) =649397772a(18) =2738792648a(19) =11638862510a(20) =49737875136a(21) =212992280024a(22) =917552497852
External references
- oeis: A148406