login
A130855
2n appears 2n+1 times, 2n+1 appears 2n times.
1
0, 2, 2, 2, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12
OFFSET
0,2
LINKS
FORMULA
G.f.: (1-x)^(-1)*Sum_{n>=0} (z^(2*n^2+n+1) + z^(2*n^2+3*n+1)). - Robert Israel, Jun 03 2019
MAPLE
seq(op([(2*n)$(2*n+1), (2*n+1)$(2*n)]), n=0..14); # Robert Israel, Jun 03 2019
MATHEMATICA
Table[{PadRight[{}, 2n+1, 2n], PadRight[{}, 2n, 2n+1]}, {n, 0, 10}]//Flatten (* Harvey P. Dale, Aug 01 2017 *)
CROSSREFS
Sequence in context: A345380 A367128 A028829 * A235963 A100196 A278078
KEYWORD
nonn
AUTHOR
Paul Curtz, Jul 22 2007
STATUS
approved