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, 0, -1), (1, 0, 1)}.
A148732
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, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =74a(6) =267a(7) =847a(8) =3167a(9) =10712a(10) =40257a(11) =139604a(12) =532924a(13) =1900636a(14) =7273193a(15) =26251803a(16) =101343481a(17) =371507374a(18) =1436174137a(19) =5301489284a(20) =20609292066a(21) =76827784934a(22) =298927689513
External references
- oeis: A148732