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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A269661 a(n) = Product_{i=1..n} (5^i - 4^i).

Table of values

n a(n)
1 1
2 9
3 549
4 202581
5 425622681
6 4907003889249
7 302963327126122509
8 98490045052104040328301
9 166544794872251942218390753281
10 1451779137596368920662880897497387769
11 64798450159010700654830227323217753649135349

List of values

[1, 9, 549, 202581, 425622681, 4907003889249, 302963327126122509, 98490045052104040328301, 166544794872251942218390753281, 1451779137596368920662880897497387769, 64798450159010700654830227323217753649135349]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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