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, 0), (-1, 1, -1), (-1, 1, 1), (1, -1, 0), (1, 0, 0)}.
A148275
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, 0), (-1, 1, -1), (-1, 1, 1), (1, -1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =40a(6) =159a(7) =477a(8) =1955a(9) =6329a(10) =27222a(11) =93788a(12) =412542a(13) =1474861a(14) =6579591a(15) =24261248a(16) =109884004a(17) =415728514a(18) =1901528670a(19) =7332329870a(20) =33799600692a(21) =132520569402a(22) =615348352600
External references
- oeis: A148275