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, -1, 1), (1, 0, -1), (1, 1, -1), (1, 1, 0)}.
A148957
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, -1, 1), (1, 0, -1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =106a(6) =387a(7) =1477a(8) =5797a(9) =23085a(10) =93684a(11) =386117a(12) =1608333a(13) =6773176a(14) =28780744a(15) =123212734a(16) =531351034a(17) =2305334993a(18) =10056498655a(19) =44094496807a(20) =194198530423a(21) =858801095475
External references
- oeis: A148957