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), (0, -1, 1), (1, 1, -1), (1, 1, 0)}.
A148998
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), (0, -1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =127a(6) =479a(7) =1987a(8) =8153a(9) =34531a(10) =149741a(11) =647735a(12) =2870859a(13) =12757149a(14) =57208157a(15) =259286825a(16) =1176744359a(17) =5390834697a(18) =24773267651a(19) =114338291417a(20) =530595471509
External references
- oeis: A148998