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, 1), (-1, 1, 0), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148209
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, 1), (-1, 1, 0), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =36a(6) =121a(7) =418a(8) =1517a(9) =5671a(10) =21784a(11) =85414a(12) =341147a(13) =1383072a(14) =5681804a(15) =23605521a(16) =99049677a(17) =419246520a(18) =1788325790a(19) =7680990743a(20) =33195379744a(21) =144265731947a(22) =630155621447
External references
- oeis: A148209