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)}.
A151264
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)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =55a(6) =215a(7) =607a(8) =2465a(9) =7506a(10) =31246a(11) =100251a(12) =424703a(13) =1416068a(14) =6078196a(15) =20874918a(16) =90520934a(17) =318287333a(18) =1391560139a(19) =4987827222a(20) =21954239238a(21) =79959969732a(22) =353939620788
External references
- oeis: A151264