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A350966
a(n) = sqrt(28*A296377(n)^2 - 3).
0
5, 37, 1307, 9403, 331973, 2388325, 84319835, 606625147, 21416906117, 154080399013, 5439809833883, 39135814724155, 1381690280900165, 9940342859536357, 350943891538808027, 2524807950507510523, 89138366760576338693, 641291279086048136485, 22640794213294851219995
OFFSET
1,1
REFERENCES
E.-A. Majol, Note #2228, L'Intermédiaire des Mathématiciens, 9 (1902), pp. 183-185.
FORMULA
G.f.: x*(1+x)*(5*x^2+32*x+5) / ( (x^2-16*x+1)*(x^2+16*x+1) ). - R. J. Mathar, Mar 07 2022
CROSSREFS
Cf. A296377. Equals 2*A296376(n)+1.
Sequence in context: A090439 A089795 A081971 * A086877 A372839 A061674
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Mar 02 2022
STATUS
approved