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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148363
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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =47a(6) =153a(7) =512a(8) =1764a(9) =6205a(10) =22178a(11) =80250a(12) =293392a(13) =1082150a(14) =4021993a(15) =15045305a(16) =56589991a(17) =213868391a(18) =811675055a(19) =3091968776a(20) =11817335422a(21) =45297815514a(22) =174089982422a(23) =670649127978
External references
- oeis: A148363