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, 0), (0, 0, 1), (1, 0, -1)}.
A148128
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, 0), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =26a(6) =75a(7) =226a(8) =694a(9) =2124a(10) =6964a(11) =22651a(12) =74306a(13) =252118a(14) =870230a(15) =2985640a(16) =10429931a(17) =36910773a(18) =130430664a(19) =465185889a(20) =1683090537a(21) =6096731410a(22) =22153416883a(23) =81263153490a(24) =298937740181
External references
- oeis: A148128