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, 1, 0), (1, 0, -1), (1, 0, 0)}.
A149973
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, 1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =56a(5) =204a(6) =780a(7) =3099a(8) =12594a(9) =52123a(10) =219696a(11) =939511a(12) =4061334a(13) =17733255a(14) =78151761a(15) =347048149a(16) =1551225434a(17) =6976462330a(18) =31550130733a(19) =143365879422a(20) =654323444492
External references
- oeis: A149973