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A055803 T(n,n-3), array T as in A055801. 3
1, 1, 1, 2, 3, 5, 7, 11, 14, 21, 25, 36, 41, 57, 63, 85, 92, 121, 129, 166, 175, 221, 231, 287, 298, 365, 377, 456, 469, 561, 575, 681, 696, 817, 833, 970, 987, 1141, 1159, 1331, 1350, 1541, 1561, 1772, 1793, 2025, 2047, 2301 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,4

COMMENTS

Third differences seem to be A002620(n)+1.

LINKS

Table of n, a(n) for n=3..50.

FORMULA

Conjecture: a(n) = (-39 +135*(-1)^n +(55-39*(-1)^n)*n +3*(-5+(-1)^n)*n^2 +2*n^3)/96 for n>3. - Colin Barker, Nov 28 2014

Empirical g.f.: x^3*(x^7-2*x^6-x^5+4*x^4+x^3-3*x^2+1) / ((x-1)^4*(x+1)^3). - Colin Barker, Nov 28 2014

CROSSREFS

Sequence in context: A070289 A035961 A051056 * A023027 A051014 A035968

Adjacent sequences:  A055800 A055801 A055802 * A055804 A055805 A055806

KEYWORD

nonn

AUTHOR

Clark Kimberling, May 28 2000

STATUS

approved

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Last modified October 22 03:52 EDT 2018. Contains 316431 sequences. (Running on oeis4.)