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, 0), (-1, 1), (0, -1), (0, 1), (1, 0), (1, 1)}.
A151485
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, 0), (-1, 1), (0, -1), (0, 1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =20a(4) =95a(5) =432a(6) =2100a(7) =10429a(8) =52990a(9) =273872a(10) =1435464a(11) =7610704a(12) =40747432a(13) =219972284a(14) =1196042952a(15) =6543872976a(16) =36000272857a(17) =199016494848
External references
- oeis: A151485