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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
A148619
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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =59a(6) =203a(7) =669a(8) =2437a(9) =8629a(10) =32187a(11) =120316a(12) =461372a(13) =1772730a(14) =6953848a(15) =27463810a(16) =109570284a(17) =440077478a(18) =1784367188a(19) =7271823208a(20) =29816949361a(21) =122989551524a(22) =510135182324
External references
- oeis: A148619