OFFSET
1,1
COMMENTS
These are the values of n for which binomial(n,6) is odd. See Maple code. - Gary Detlefs, Nov 29 2011
LINKS
FORMULA
a(n) = 8*n-a(n-1)-3 with n>1, a(1)=6. - Vincenzo Librandi, Aug 06 2010
a(n) = 6*floor((n-1)/2) + n + 5. - Gary Detlefs, Nov 29 2011
a(n) = a(n-1)+a(n-2)-a(n-3). G.f.: x*(6+x+x^2)/((1-x)^2*(1+x)). - Colin Barker, Mar 18 2012
a(n) = (1-3*(-1)^n+8*n)/2. - Colin Barker, May 14 2012
Sum_{n>=1} (-1)^(n+1)/a(n) = sqrt(2)*Pi/16 - log(2)/8 - sqrt(2)*log(sqrt(2)+1)/8. - Amiram Eldar, Dec 18 2021
MAPLE
for i from 1 to 240 do if(floor((i mod 8)/6) <>0) then print(i) fi od; # Gary Detlefs, Nov 30 2011
MATHEMATICA
LinearRecurrence[{1, 1, -1}, {6, 7, 14}, 60] (* Harvey P. Dale, Sep 11 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved
