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, 0, 1), (1, 0, 1), (1, 1, -1)}.
A150550
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, 0, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =105a(5) =438a(6) =1896a(7) =8380a(8) =37666a(9) =171524a(10) =789385a(11) =3663473a(12) =17121748a(13) =80491867a(14) =380291975a(15) =1804415971a(16) =8593358992a(17) =41057395582a(18) =196722487503a(19) =944952532027
External references
- oeis: A150550