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, -1), (1, 0, 1)}.
A148829
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, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =87a(6) =324a(7) =1157a(8) =4635a(9) =17413a(10) =71379a(11) =282310a(12) =1184826a(13) =4816221a(14) =20574697a(15) =85413385a(16) =370033453a(17) =1564014542a(18) =6843477551a(19) =29329378121a(20) =129458112478a(21) =561010625695
External references
- oeis: A148829