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, 0)}.
A151287
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, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =76a(5) =290a(6) =1148a(7) =4627a(8) =19038a(9) =79554a(10) =336112a(11) =1435522a(12) =6184704a(13) =26838474a(14) =117247440a(15) =515135847a(16) =2274656290a(17) =10090187786a(18) =44940868940a(19) =200897459804a(20) =901082056408
External references
- oeis: A151287