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, 0, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A148908
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, 0, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =106a(6) =427a(7) =1596a(8) =6692a(9) =26473a(10) =113271a(11) =466467a(12) =2030691a(13) =8571835a(14) =37813319a(15) =162709710a(16) =725083181a(17) =3163603626a(18) =14215151860a(19) =62732129567a(20) =283740210409
External references
- oeis: A148908