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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 0, -1), (1, 0, 0)}.
A148737
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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =84a(6) =321a(7) =1242a(8) =4968a(9) =20468a(10) =85488a(11) =365116a(12) =1576455a(13) =6899462a(14) =30489198a(15) =135943699a(16) =610946248a(17) =2764344098a(18) =12585238942a(19) =57609238284a(20) =265003230438
External references
- oeis: A148737