Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.
A149912
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =45a(5) =151a(6) =518a(7) =1806a(8) =6604a(9) =24138a(10) =90451a(11) =344190a(12) =1312996a(13) =5106882a(14) =19926445a(15) =78339046a(16) =311259179a(17) =1238154478a(18) =4968174386a(19) =20022386841a(20) =80905863184a(21) =329131229308
External references
- oeis: A149912