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, 0, 0), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.
A148853
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, 0, 0), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =91a(6) =352a(7) =1306a(8) =5182a(9) =20797a(10) =85424a(11) =355119a(12) =1504967a(13) =6418859a(14) =27758070a(15) =120917363a(16) =531015804a(17) =2349303542a(18) =10455790760a(19) =46802437636a(20) =210614263933a(21) =951984893677
External references
- oeis: A148853