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, 1, 0)}.
A149986
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, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =55a(5) =200a(6) =747a(7) =2886a(8) =11407a(9) =46180a(10) =188759a(11) =784953a(12) =3291063a(13) =13948318a(14) =59537085a(15) =256217269a(16) =1108406473a(17) =4826799850a(18) =21108279413a(19) =92791015661a(20) =409373685603
External references
- oeis: A149986