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)}.
A149861
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) =2a(2) =5a(3) =13a(4) =39a(5) =126a(6) =425a(7) =1450a(8) =5047a(9) =17992a(10) =65529a(11) =241627a(12) =898491a(13) =3371044a(14) =12776049a(15) =48846741a(16) =187977471a(17) =727253048a(18) =2828708897a(19) =11061969253a(20) =43468440939a(21) =171505019064a(22) =679127110969
External references
- oeis: A149861