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), (0, 0, 1), (1, 0, -1)}.
A148001
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), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =39a(7) =87a(8) =264a(9) =643a(10) =1945a(11) =5027a(12) =15659a(13) =41832a(14) =134380a(15) =376573a(16) =1225126a(17) =3515489a(18) =11582825a(19) =33844093a(20) =112853849a(21) =337902986a(22) =1138451728a(23) =3459396303a(24) =11738577057a(25) =36082261848a(26) =123238143492a(27) =384308854945
External references
- oeis: A148001