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, 0, 1), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148802
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, 0, 1), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =80a(6) =277a(7) =930a(8) =3318a(9) =11643a(10) =42412a(11) =152958a(12) =565237a(13) =2075930a(14) =7753263a(15) =28843854a(16) =108607503a(17) =407906636a(18) =1545829275a(19) =5848333453a(20) =22278963147a(21) =84775245709a(22) =324339392219
External references
- oeis: A148802