A376186 a(n) = denominator of the sum S(n) defined in A376184.

8, 40, 680, 231880, 21507565640, 231287689900961870440, 21397598199889399837872215012598300187880, 228928604361955042169940915981517711585578107873998357253128210226981219949635080

Offset

1,1

Links

Table of n, a(n) for n=1..8.

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]

Example

The initial values of S(n) are 5/8, 37/40, 677/680, 231877/231880, 21507565637/21507565640, 231287689900961870437/231287689900961870440, ...

Crossrefs

Cf. A004168, A082732, A374663, A375516, A375531, A375532, A375781, A375522, A376048-A376062, A376184, A376185.

Sequence in context: A343868 A350125 A096969 * A209829 A209848 A093104

Adjacent sequences: A376183 A376184 A376185 * A376187 A376188 A376189

Keyword

nonn,frac,base

Author

N. J. A. Sloane, Sep 15 2024

Status

approved