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A323120
Number of compositions of n where the difference between largest and smallest parts equals three.
2
0, 0, 2, 3, 12, 23, 58, 123, 266, 557, 1168, 2400, 4911, 9982, 20196, 40643, 81499, 162899, 324678, 645404, 1280042, 2533565, 5005449, 9872464, 19442206, 38234945, 75096856, 147324049, 288705896, 565201569, 1105475313, 2160338661, 4218403428, 8230986025
OFFSET
3,3
LINKS
FORMULA
a(n) ~ c * d^n, where d = A086088 = 1.92756197548292530426190586173662216869855... is the real root of the equation d^4 - d^3 - d^2 - d - 1 = 0 and c = 0.566342887702651534849280952809003081138499070062015666102331676335... is the real root of the equation 563*c^4 - 563*c^3 + 174*c^2 - 22*c + 1 = 0. - Vaclav Kotesovec, Jan 07 2019
CROSSREFS
Column k=3 of A214258.
Sequence in context: A282234 A024780 A295366 * A323121 A323122 A323123
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jan 05 2019
STATUS
approved