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, 1), (0, 1, -1), (1, 0, 1)}.
A149203
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, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =39a(5) =133a(6) =503a(7) =1903a(8) =7473a(9) =29283a(10) =117340a(11) =472735a(12) =1923988a(13) =7866991a(14) =32415016a(15) =134128943a(16) =557609799a(17) =2326658582a(18) =9745447103a(19) =40938439634a(20) =172464891400a(21) =728418140034
External references
- oeis: A149203