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), (0, 0, 1), (1, -1, 0), (1, -1, 1), (1, 1, -1)}.
A148478
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), (0, 0, 1), (1, -1, 0), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =69a(6) =248a(7) =929a(8) =3593a(9) =14235a(10) =57459a(11) =235273a(12) =975586a(13) =4091859a(14) =17331431a(15) =74022586a(16) =318434137a(17) =1378696760a(18) =6004079607a(19) =26284438789a(20) =115608994109a(21) =510654253982
External references
- oeis: A148478