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, 0, 0), (1, 0, -1), (1, 1, 1)}.
A149261
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, 0, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =40a(5) =124a(6) =468a(7) =1587a(8) =6088a(9) =21336a(10) =82448a(11) =296644a(12) =1154944a(13) =4229676a(14) =16534082a(15) =61286243a(16) =240337638a(17) =899636560a(18) =3537236462a(19) =13340249882a(20) =52549370182a(21) =199366130380a(22) =786567323046
External references
- oeis: A149261