A026636 Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026626.

1, 1, 2, 4, 6, 11, 17, 30, 47, 78, 125, 205, 330, 536, 866, 1404, 2270, 3675, 5945, 9622, 15567, 25190, 40757, 65949, 106706, 172656, 279362, 452020, 731382, 1183403, 1914785, 3098190, 5012975, 8111166, 13124141, 21235309

Offset

0,3

Links

Table of n, a(n) for n=0..35.

Formula

G.f.: (x^7+x^5-x^4+x^3+1)/[(1-x^4)(1-x-x^2)].

Crossrefs

Sequence in context: A014217 A034297 A326495 * A026658 A138688 A131298

Adjacent sequences: A026633 A026634 A026635 * A026637 A026638 A026639

Keyword

nonn

Author

Clark Kimberling

Status

approved