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, 0, 0), (0, -1, 1), (1, 1, 0)}.
A148667
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, 0, 0), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =19a(5) =60a(6) =169a(7) =539a(8) =1713a(9) =5412a(10) =18241a(11) =58932a(12) =197794a(13) =670464a(14) =2252141a(15) =7793403a(16) =26523661a(17) =91645156a(18) =319356023a(19) =1106651892a(20) =3895231214a(21) =13604856592a(22) =47889319173a(23) =169562551244a(24) =598458138702
External references
- oeis: A148667