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, 0, 1), (1, 0, 0), (1, 1, -1)}.
A148130
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, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =27a(6) =82a(7) =228a(8) =741a(9) =2204a(10) =7439a(11) =23265a(12) =80801a(13) =261285a(14) =925254a(15) =3073545a(16) =11054792a(17) =37460250a(18) =136318642a(19) =469722070a(20) =1726066940a(21) =6026557952a(22) =22317897676a(23) =78816482647a(24) =293824628003
External references
- oeis: A148130