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), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)}.
A151482
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), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =93a(6) =359a(7) =1332a(8) =5400a(9) =21460a(10) =89844a(11) =373197a(12) =1600682a(13) =6853799a(14) =29959582a(15) =131136020a(16) =582046108a(17) =2590492619a(18) =11642984469a(19) =52500378935a(20) =238444506195
External references
- oeis: A151482