OFFSET
1,2
COMMENTS
Coefficient of y^(n+1) in (y^2+2*y+1)*(y^2+y+1)^(2*n-2). - Robert Israel, Sep 07 2019
LINKS
Robert Israel, Table of n, a(n) for n = 1..1278
MAPLE
f:= n -> coeff((y^2+2*y+1)*(y^2+y+1)^(2*n-2), y, n+1);
map(f, [$1..30]); # Robert Israel, Sep 07 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Sean A. Irvine, Sep 07 2019
STATUS
approved