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, 0, 1), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.
A148335
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, 0, 1), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =44a(6) =144a(7) =487a(8) =1690a(9) =5968a(10) =21410a(11) =77778a(12) =285486a(13) =1057276a(14) =3944582a(15) =14810725a(16) =55915246a(17) =212094912a(18) =807838800a(19) =3088078508a(20) =11842326972a(21) =45542436464a(22) =175586377976a(23) =678496358882
External references
- oeis: A148335