A376185 a(n) = denominator of the sum S(n) defined in A376062.

12, 48, 624, 97968, 2399530224, 1439436326371902768, 517994234419759747473589427583418224, 67079506723028253472357256785558488997471406450171845011442457607246768

Offset: 1

Author

N. J. A. Sloane, Sep 15 2024

Keywords

• nonn
• frac

Examples

			The initial values of S(n) are 7/12, 43/48, 619/624, 97963/97968, 2399530219/2399530224, 1439436326371902763/1439436326371902768 ...
		

Links

• N. J. A. Sloane, A Nasty Surprise in a Sequence and Other OEIS Stories, Experimental Mathematics Seminar, Rutgers University, Oct 10 2024, Youtube video; Slides [Mentions this sequence]

Crossrefs

Cf. A374663, A375516, A375531, A375532, A375781, A375522, A376048-A376062.

Formula

1/a(n) = 1/a(n-1) - 1/(4*A376062(n)) for n >= 2.