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, 0), (0, 1, -1), (1, 0, 1)}.
A148768
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, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =20a(5) =67a(6) =205a(7) =624a(8) =2153a(9) =7063a(10) =23186a(11) =81508a(12) =278425a(13) =948750a(14) =3384908a(15) =11847193a(16) =41298456a(17) =149008573a(18) =529767107a(19) =1876095094a(20) =6825387722a(21) =24534558825a(22) =87900272775a(23) =321769750934
External references
- oeis: A148768