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, 0), (-1, 1, 1), (0, -1, 0), (0, 0, -1), (1, 0, 0)}.
A148704
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, 0), (-1, 1, 1), (0, -1, 0), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =73a(6) =255a(7) =895a(8) =3309a(9) =12311a(10) =47361a(11) =183183a(12) =724733a(13) =2881317a(14) =11647367a(15) =47278907a(16) =194370111a(17) =801915951a(18) =3341949461a(19) =13969919759a(20) =58876304081a(21) =248789702749
External references
- oeis: A148704