

A026397


Sum{T(nk,k)}, 0<=k<=[ n/2 ], where T is the array in A026386.


0



1, 2, 3, 6, 10, 17, 31, 53, 92, 163, 282, 492, 863, 1501, 2621, 4582, 7987, 13946, 24354, 42489, 74179, 129497, 226000, 394523, 688670, 1202020, 2098239, 3662553, 6392969, 11159290, 19478867, 34000750, 59349706, 103596641
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,2


LINKS

Table of n, a(n) for n=0..33.
Index entries for linear recurrences with constant coefficients, signature (0,1,3,1).


FORMULA

Pairwise sums of A026385.  Ralf Stephan, Jul 22 2003
G.f.: [(1+x)(1+x+x^2)]/[1x^23x^3x^4].  Ralf Stephan, Apr 30 2004


MATHEMATICA

LinearRecurrence[{0, 1, 3, 1}, {1, 2, 3, 6}, 40] (* Harvey P. Dale, Apr 15 2015 *)


CROSSREFS

Sequence in context: A135431 A123908 A233268 * A193200 A026779 A081028
Adjacent sequences: A026394 A026395 A026396 * A026398 A026399 A026400


KEYWORD

nonn


AUTHOR

Clark Kimberling


STATUS

approved



