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, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148847
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, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =90a(6) =346a(7) =1268a(8) =5042a(9) =19996a(10) =81938a(11) =339484a(12) =1430989a(13) =6091398a(14) =26262618a(15) =114062647a(16) =500199764a(17) =2207452156a(18) =9810250085a(19) =43847809271a(20) =197025418977a(21) =889648032464
External references
- oeis: A148847