This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A152764 Bisection of A138144. 3
 1, 111, 11011, 1100011, 110000011, 11000000011, 1100000000011, 110000000000011, 11000000000000011, 1100000000000000011, 110000000000000000011, 11000000000000000000011 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Index entries for linear recurrences with constant coefficients, signature (101,-100). FORMULA a(n) = 11+11000*100^(n-3)-(111/10)*{C[2*(n-1),n-1] mod 2}-10*{C[2*(n-2),n-2] mod 2}, with n>=1 [From Paolo P. Lava, Dec 23 2008] a(n) = 11+11*10^(2*n-3) for n>2. a(n) = 101*a(n-1)-100*a(n-2) for n>4. G.f.: -x*(10*x-1)*(10*x+1)^2 / ((x-1)*(100*x-1)). [Colin Barker, Sep 16 2013] EXAMPLE n ...... a(n) 1 ....... 1 2 ...... 111 3 ..... 11011 4 .... 1100011 5 ... 110000011 PROG (PARI) Vec(-x*(10*x-1)*(10*x+1)^2/((x-1)*(100*x-1)) + O(x^100)) \\ Colin Barker, Sep 16 2013 CROSSREFS Cf. A135577, A138120, A138146, A152756, A152758, A058764. Sequence in context: A287191 A245549 A266809 * A249183 A071033 A267364 Adjacent sequences:  A152761 A152762 A152763 * A152765 A152766 A152767 KEYWORD easy,nonn AUTHOR Omar E. Pol, Dec 14 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 19 06:30 EDT 2019. Contains 322237 sequences. (Running on oeis4.)