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A350965
a(n) = sqrt(6*A138288(n)^2 - 2).
0
2, 22, 218, 2158, 21362, 211462, 2093258, 20721118, 205117922, 2030458102, 20099463098, 198964172878, 1969542265682, 19496458483942, 192995042573738, 1910453967253438, 18911544629960642, 187204992332352982, 1853138378693569178
OFFSET
0,1
REFERENCES
H. Brocard, Note #2049, L'Intermédiaire des Mathématiciens, 8 (1901), pp. 212-213.
FORMULA
G.f.: 2*(1+x)/(1-10*x+x^2) . - R. J. Mathar, Mar 07 2022
CROSSREFS
Cf. A138288. Equals 2*A054320.
Sequence in context: A308313 A304024 A239688 * A336894 A037567 A174200
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Mar 02 2022
STATUS
approved