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), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
A148793
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), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =80a(6) =268a(7) =923a(8) =3245a(9) =11598a(10) =42035a(11) =153962a(12) =568956a(13) =2118875a(14) =7941310a(15) =29924675a(16) =113311965a(17) =430839470a(18) =1644074844a(19) =6294293928a(20) =24166315996a(21) =93020242891a(22) =358881594364
External references
- oeis: A148793