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), (-1, 0, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
A148375
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), (-1, 0, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =45a(6) =139a(7) =469a(8) =1658a(9) =5609a(10) =19819a(11) =72907a(12) =273302a(13) =1001029a(14) =3764252a(15) =14482663a(16) =56301014a(17) =215614487a(18) =840666091a(19) =3327207607a(20) =13256846148a(21) =52244731775a(22) =208630339806a(23) =842156982607
External references
- oeis: A148375