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), (1, 0, 0), (1, 1, -1)}.
A148234
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), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =34a(6) =116a(7) =330a(8) =1162a(9) =3536a(10) =12877a(11) =41066a(12) =151769a(13) =498166a(14) =1860262a(15) =6254556a(16) =23590016a(17) =80834615a(18) =306837983a(19) =1066600624a(20) =4068927054a(21) =14319207670a(22) =54880379628a(23) =195141810984a(24) =750525883409
External references
- oeis: A148234