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), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
A149674
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), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =65a(5) =261a(6) =1085a(7) =4555a(8) =19567a(9) =84709a(10) =370249a(11) =1633547a(12) =7258227a(13) =32402035a(14) =145428535a(15) =655641593a(16) =2966918443a(17) =13471545253a(18) =61360832927a(19) =280227228003
External references
- oeis: A149674