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, -1, 1), (1, 0, 0)}.
A149831
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, -1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =87a(6) =295a(7) =1011a(8) =3598a(9) =13171a(10) =49215a(11) =188648a(12) =731630a(13) =2882646a(14) =11497352a(15) =46321975a(16) =188702021a(17) =774475721a(18) =3205565577a(19) =13357588629a(20) =56011879418a(21) =236310987398
External references
- oeis: A149831