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, 0), (-1, -1, 1), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.
A148922
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, 0), (-1, -1, 1), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =26a(5) =90a(6) =323a(7) =1129a(8) =4241a(9) =15991a(10) =60977a(11) =237469a(12) =927444a(13) =3673875a(14) =14661668a(15) =58676083a(16) =237287338a(17) =963042413a(18) =3922169567a(19) =16073137718a(20) =66046964584a(21) =272342523317
External references
- oeis: A148922