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, 0), (-1, 0, 1), (1, -1, 0), (1, 1, 0)}.
A149271
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, 0), (-1, 0, 1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =42a(5) =131a(6) =561a(7) =1897a(8) =8264a(9) =30205a(10) =133945a(11) =505237a(12) =2280622a(13) =8858735a(14) =40332662a(15) =160335565a(16) =735744074a(17) =2972238961a(18) =13729284799a(19) =56239449957a(20) =261023413798
External references
- oeis: A149271