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, 1, 1), (1, 0, 1), (1, 1, 0)}.
A150078
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, 1, 1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =68a(5) =224a(6) =866a(7) =3044a(8) =11856a(9) =42830a(10) =168438a(11) =619340a(12) =2452088a(13) =9130458a(14) =36233300a(15) =136303418a(16) =541799748a(17) =2052445408a(18) =8171539956a(19) =31128440400a(20) =124091086076a(21) =474862499816
External references
- oeis: A150078