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), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
A148423
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), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =18a(5) =59a(6) =210a(7) =771a(8) =2996a(9) =11644a(10) =46638a(11) =190413a(12) =785883a(13) =3269350a(14) =13802880a(15) =58805780a(16) =251800165a(17) =1085863136a(18) =4718853763a(19) =20599960049a(20) =90292141257a(21) =397829888521
External references
- oeis: A148423