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, 0, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148469
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, 0, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =63a(6) =233a(7) =881a(8) =3454a(9) =13895a(10) =56957a(11) =237185a(12) =1001514a(13) =4274113a(14) =18421481a(15) =80049553a(16) =350339864a(17) =1543114276a(18) =6834599858a(19) =30421512784a(20) =136016594930a(21) =610563182006
External references
- oeis: A148469