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, 0, -1), (0, 1, 0), (1, -1, 1)}.
A148409
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, 0, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =55a(6) =187a(7) =664a(8) =2461a(9) =9313a(10) =36036a(11) =141602a(12) =564987a(13) =2283709a(14) =9329500a(15) =38470803a(16) =160040669a(17) =670687191a(18) =2829541104a(19) =12011760502a(20) =51268044607a(21) =219910158631a(22) =947691098759
External references
- oeis: A148409