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, 1), (-1, 1, 1), (1, 1, -1), (1, 1, 0)}.
A149227
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, 1), (-1, 1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =46a(5) =139a(6) =667a(7) =2269a(8) =11056a(9) =40420a(10) =198622a(11) =761287a(12) =3761083a(13) =14905342a(14) =73897519a(15) =300239101a(16) =1492016545a(17) =6179650609a(18) =30758939461a(19) =129359690452a(20) =644617200640
External references
- oeis: A149227