Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (1, -1), (1, 0), (1, 1)}.
A151312
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =39a(4) =210a(5) =960a(6) =5340a(7) =26250a(8) =148610a(9) =761796a(10) =4360356a(11) =22971102a(12) =132469260a(13) =711426144a(14) =4124979144a(15) =22471772895a(16) =130833575730a(17) =720642479700
External references
- oeis: A151312