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, 0), (0, -1), (1, -1), (1, 1)}.
A151276
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, 0), (0, -1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =273a(6) =1181a(7) =5049a(8) =22277a(9) =98801a(10) =445357a(11) =2019337a(12) =9240325a(13) =42516417a(14) =196833789a(15) =915399225a(16) =4276244117a(17) =20050107057a(18) =94335358413a(19) =445185708105
External references
- oeis: A151276