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, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A148724
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, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =71a(6) =249a(7) =847a(8) =3029a(9) =10683a(10) =39689a(11) =147239a(12) =551221a(13) =2092331a(14) =8054273a(15) =31025487a(16) =120541229a(17) =472911683a(18) =1862132473a(19) =7357610135a(20) =29280001861a(21) =117020171467a(22) =468756101073
External references
- oeis: A148724