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, 0), (1, 0, 1), (1, 1, -1)}.
A148823
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, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =79a(6) =291a(7) =958a(8) =3536a(9) =11919a(10) =45346a(11) =159573a(12) =608185a(13) =2165579a(14) =8367723a(15) =30441954a(16) =117663978a(17) =430907544a(18) =1678947661a(19) =6228642012a(20) =24271972371a(21) =90437139766a(22) =354216216105
External references
- oeis: A148823