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, 1), (1, 0, 1), (1, 1, -1)}.
A148723
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, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =70a(6) =255a(7) =781a(8) =2945a(9) =9566a(10) =36273a(11) =121772a(12) =468394a(13) =1617306a(14) =6235943a(15) =21900361a(16) =85097623a(17) =303805020a(18) =1182002913a(19) =4263539140a(20) =16667966492a(21) =60771203088a(22) =237764335169a(23) =872895295404
External references
- oeis: A148723