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, -1), (-1, -1, 1), (-1, 1, -1), (0, 0, 1), (1, 0, -1)}.
A148003
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, -1), (-1, -1, 1), (-1, 1, -1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =39a(7) =87a(8) =292a(9) =727a(10) =2335a(11) =6017a(12) =20202a(13) =53701a(14) =183968a(15) =522887a(16) =1873962a(17) =5426121a(18) =19352445a(19) =56803179a(20) =204665230a(21) =616967865a(22) =2279893562a(23) =7034715929a(24) =26122658700a(25) =81123135697a(26) =301562157637a(27) =947863107231
External references
- oeis: A148003