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), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
A148239
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), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =36a(6) =110a(7) =335a(8) =1104a(9) =3753a(10) =13113a(11) =44896a(12) =157137a(13) =567676a(14) =2089014a(15) =7618757a(16) =28048073a(17) =104358663a(18) =393485284a(19) =1490450576a(20) =5677409041a(21) =21612120855a(22) =83008243421a(23) =321100456265
External references
- oeis: A148239