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), (0, 0, -1), (1, 0, 1)}.
A148519
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), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =17a(5) =40a(6) =127a(7) =353a(8) =1069a(9) =3368a(10) =10321a(11) =33488a(12) =105552a(13) =343166a(14) =1133979a(15) =3705445a(16) =12442819a(17) =41163466a(18) =138773655a(19) =470967778a(20) =1591257280a(21) =5457961386a(22) =18563391871a(23) =63911562446a(24) =220832875804a(25) =761357285596
External references
- oeis: A148519