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), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
A149618
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), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =65a(5) =231a(6) =1077a(7) =4077a(8) =19521a(9) =77847a(10) =375523a(11) =1542669a(12) =7503275a(13) =31482945a(14) =153831367a(15) =656080547a(16) =3217363353a(17) =13890626113a(18) =68303798347a(19) =297856509483
External references
- oeis: A149618