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, 0), (-1, 1, -1), (0, 0, 1), (1, 0, -1)}.
A148002
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, 0), (-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) =282a(9) =717a(10) =2145a(11) =5807a(12) =18226a(13) =50197a(14) =152504a(15) =466049a(16) =1518118a(17) =4645813a(18) =14702657a(19) =46857147a(20) =150247490a(21) =470691795a(22) =1534124568a(23) =5119363053a(24) =16980777560a(25) =55558457979a(26) =184820922541a(27) =617405147985
External references
- oeis: A148002