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, 1, -1), (0, 1, 1), (1, -1, 0), (1, -1, 1)}.
A148761
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, 1, -1), (0, 1, 1), (1, -1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =29a(5) =78a(6) =338a(7) =1058a(8) =4698a(9) =15815a(10) =71857a(11) =254131a(12) =1171908a(13) =4300017a(14) =20035297a(15) =75618646a(16) =355106839a(17) =1370474585a(18) =6475644291a(19) =25446998630a(20) =120843594317a(21) =482024049999
External references
- oeis: A148761