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, -1, 0), (1, -1, 1), (1, 1, 0)}.
A149248
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, -1, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =127a(6) =469a(7) =1677a(8) =6378a(9) =24095a(10) =93609a(11) =362445a(12) =1436332a(13) =5676421a(14) =22781348a(15) =91416871a(16) =370922058a(17) =1504651077a(18) =6159395169a(19) =25221691069a(20) =103977918900a(21) =428932959075
External references
- oeis: A149248