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, 1, 0), (1, -1, 1), (1, 0, -1), (1, 0, 1)}.
A148885
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, 1, 0), (1, -1, 1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =30a(5) =98a(6) =385a(7) =1421a(8) =5830a(9) =22734a(10) =96060a(11) =391011a(12) =1682527a(13) =7025828a(14) =30735068a(15) =131095245a(16) =579566727a(17) =2508794437a(18) =11201544301a(19) =49105011986a(20) =220777304176a(21) =977128722768
External references
- oeis: A148885