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), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148459
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), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =57a(6) =198a(7) =709a(8) =2601a(9) =9864a(10) =38148a(11) =149808a(12) =598372a(13) =2419970a(14) =9889001a(15) =40838480a(16) =170083988a(17) =713613807a(18) =3015878875a(19) =12823991428a(20) =54829658278a(21) =235678930783
External references
- oeis: A148459