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, 1, -1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
A148987
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, 1, -1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =107a(6) =441a(7) =1675a(8) =6829a(9) =26947a(10) =115669a(11) =474921a(12) =2054775a(13) =8602293a(14) =37922487a(15) =162930585a(16) =720453423a(17) =3124409345a(18) =14010065523a(19) =61601080593a(20) =276959416907
External references
- oeis: A148987