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, 0), (-1, 0, 1), (-1, 1, -1), (1, 0, 0)}.
A148507
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, 0), (-1, 0, 1), (-1, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =17a(5) =34a(6) =126a(7) =279a(8) =1095a(9) =2588a(10) =10568a(11) =26135a(12) =109831a(13) =280825a(14) =1206019a(15) =3163573a(16) =13817947a(17) =36988956a(18) =163766640a(19) =445663467a(20) =1995178007a(21) =5504179695a(22) =24870604773a(23) =69405571235a(24) =316074230017a(25) =890773057954
External references
- oeis: A148507