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), (0, 0, -1), (1, 0, -1), (1, 1, 0)}.
A148950
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), (0, 0, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =102a(6) =397a(7) =1490a(8) =5979a(9) =24287a(10) =100419a(11) =422102a(12) =1801426a(13) =7746419a(14) =33739171a(15) =147966234a(16) =654198310a(17) =2911588244a(18) =13035624845a(19) =58685408132a(20) =265476086946
External references
- oeis: A148950