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), (1, -1, 0), (1, -1, 1), (1, 1, 1)}.
A149570
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), (1, -1, 0), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =63a(5) =201a(6) =991a(7) =3543a(8) =17589a(9) =66675a(10) =331981a(11) =1310121a(12) =6533329a(13) =26526137a(14) =132398363a(15) =548964603a(16) =2741549255a(17) =11553795573a(18) =57721223997a(19) =246430668963
External references
- oeis: A149570