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, 1), (1, 1, 0)}.
A148677
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, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =67a(6) =195a(7) =653a(8) =2099a(9) =6933a(10) =23423a(11) =78535a(12) =271285a(13) =925973a(14) =3206663a(15) =11185071a(16) =38983433a(17) =137051515a(18) =482479299a(19) =1708206559a(20) =6052735529a(21) =21521991943a(22) =76778794491a(23) =274300787629a(24) =982476049335
External references
- oeis: A148677