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, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
A148198
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, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =33a(6) =108a(7) =360a(8) =1259a(9) =4495a(10) =16726a(11) =63085a(12) =243465a(13) =956363a(14) =3809943a(15) =15373894a(16) =62802682a(17) =259047003a(18) =1078374062a(19) =4527106194a(20) =19143470222a(21) =81500734973a(22) =349136767609
External references
- oeis: A148198