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, -1), (-1, -1, 1), (-1, 1, 0), (1, 0, 0), (1, 1, -1)}.
A148027
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, -1), (-1, -1, 1), (-1, 1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =50a(7) =123a(8) =424a(9) =1157a(10) =4118a(11) =11905a(12) =44192a(13) =134684a(14) =512943a(15) =1629383a(16) =6357396a(17) =20847452a(18) =83017169a(19) =279238026a(20) =1129642409a(21) =3880637177a(22) =15899231818a(23) =55624783220a(24) =230299526462a(25) =818618381183
External references
- oeis: A148027