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, 0), (-1, 0, -1), (1, -1, -1), (1, 1, 1)}.
A149497
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, 0), (-1, 0, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =45a(5) =109a(6) =497a(7) =1505a(8) =6277a(9) =21933a(10) =87881a(11) =327701a(12) =1317185a(13) =5003189a(14) =20502937a(15) =78367049a(16) =325943661a(17) =1259386365a(18) =5266016649a(19) =20655292081a(20) =86435272421a(21) =343588605953
External references
- oeis: A149497