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), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.
A149876
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), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =42a(5) =136a(6) =451a(7) =1546a(8) =5407a(9) =19191a(10) =69191a(11) =251867a(12) =925820a(13) =3430082a(14) =12789590a(15) =47974023a(16) =180826904a(17) =684611939a(18) =2601928569a(19) =9922514404a(20) =37956726661a(21) =145587887723a(22) =559808213755
External references
- oeis: A149876