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, 1, -1), (0, 0, 1), (1, 0, -1)}.
A148000
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, 1, -1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =39a(7) =87a(8) =254a(9) =633a(10) =1755a(11) =4817a(12) =13683a(13) =38328a(14) =109188a(15) =327645a(16) =962488a(17) =2855001a(18) =8585783a(19) =26100683a(20) =79038683a(21) =239634748a(22) =749702378a(23) =2323224093a(24) =7216147407a(25) =22570101754a(26) =71214487008a(27) =224091470121a(28) =704212414119
External references
- oeis: A148000