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, 0, -1), (0, 1, 1), (1, -1, -1)}.
A148061
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, 0, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =25a(6) =77a(7) =181a(8) =696a(9) =1809a(10) =5831a(11) =17449a(12) =61892a(13) =186457a(14) =600842a(15) =2051147a(16) =6945364a(17) =22680521a(18) =75134871a(19) =268438305a(20) =907010728a(21) =3061029857a(22) =10612359584a(23) =37969347183a(24) =130531373630a(25) =448942777209
External references
- oeis: A148061