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), (-1, 1, 1), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
A148361
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), (-1, 1, 1), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =46a(6) =160a(7) =567a(8) =2130a(9) =8196a(10) =32488a(11) =131481a(12) =541914a(13) =2269092a(14) =9626174a(15) =41318215a(16) =179138680a(17) =783632812a(18) =3455177987a(19) =15342105002a(20) =68557162752a(21) =308103758161
External references
- oeis: A148361