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), (1, 0), (1, 1)}.
A151450
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), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =0a(2) =4a(3) =5a(4) =34a(5) =98a(6) =458a(7) =1703a(8) =7632a(9) =31222a(10) =139078a(11) =601834a(12) =2692054a(13) =12000298a(14) =54304846a(15) =246205555a(16) =1126480236a(17) =5170553126a(18) =23870651114a(19) =110597543652a(20) =514517316974
External references
- oeis: A151450