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, 0), (-1, 0, 0), (0, 1, 1), (1, 0, -1), (1, 1, -1)}.
A148926
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, 0), (-1, 0, 0), (0, 1, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =27a(5) =93a(6) =335a(7) =1193a(8) =4499a(9) =17397a(10) =66791a(11) =264641a(12) =1065531a(13) =4268397a(14) =17449359a(15) =72138297a(16) =297057699a(17) =1240941285a(18) =5227368119a(19) =21948770097a(20) =93160744715a(21) =397989148381
External references
- oeis: A148926