Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, 1)}.
A151465
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =16a(4) =69a(5) =288a(6) =1294a(7) =5863a(8) =27428a(9) =129525a(10) =622671a(11) =3017788a(12) =14788994a(13) =72961131a(14) =362686254a(15) =1812678169a(16) =9109932551a(17) =45985005522a(18) =233114127299
External references
- oeis: A151465