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A323121
Number of compositions of n where the difference between largest and smallest parts equals four.
2
0, 0, 2, 3, 12, 23, 61, 132, 294, 639, 1377, 2922, 6178, 12953, 27021, 56106, 116030, 239090, 491202, 1006361, 2056755, 4194230, 8536023, 17340787, 35168957, 71217347, 144012394, 290835635, 586637532, 1181960546, 2378920014, 4783326807, 9609050910, 19286596636
OFFSET
4,3
LINKS
FORMULA
a(n) ~ c * d^n, where d = 1.9659482366454853371899373759344013961513... is the real root of the equation d^5 - d^4 - d^3 - d^2 - d - 1 = 0 or d^6 - 2*d^5 + 1 = 0 and c = 0.53792611681915978492363258130015596032604545873525287924... is the real root of the equation 9584*c^5 - 9584*c^4 + 3160*c^3 - 480*c^2 + 35*c - 1 = 0. - Vaclav Kotesovec, Jan 07 2019
CROSSREFS
Column k=4 of A214258.
Sequence in context: A024780 A295366 A323120 * A323122 A323123 A323124
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jan 05 2019
STATUS
approved