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, -1), (1, -1, 0), (1, 0, -1), (1, 0, 1)}.
A148603
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, -1), (1, -1, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =58a(6) =198a(7) =642a(8) =2350a(9) =8252a(10) =31002a(11) =114202a(12) =442764a(13) =1686722a(14) =6668388a(15) =26057670a(16) =104922324a(17) =417908598a(18) =1705897816a(19) =6903301784a(20) =28520655252a(21) =116886258244a(22) =487649280536
External references
- oeis: A148603