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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148861
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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =96a(6) =354a(7) =1276a(8) =4948a(9) =19152a(10) =76476a(11) =305204a(12) =1247268a(13) =5097039a(14) =21201259a(15) =88365760a(16) =372586056a(17) =1573678198a(18) =6711499316a(19) =28681918821a(20) =123466821593a(21) =532621054850
External references
- oeis: A148861