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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.

A261643 a(n) = Sum_{k=1..n} (k^2 + k)^(n-k).

Table of values

n a(n)
1 1
2 3
3 11
4 57
5 397
6 3487
7 37519
8 484437
9 7353473
10 129104523
11 2589967603
12 58757627185
13 1493762354293
14 42223299711159
15 1318186323111959
16 45185985199663629
17 1691822823829309801
18 68865092213424362659
19 3034735030143197197435
20 144238580771432519823465
21 7368717925255301486594525

List of values

[1, 3, 11, 57, 397, 3487, 37519, 484437, 7353473, 129104523, 2589967603, 58757627185, 1493762354293, 42223299711159, 1318186323111959, 45185985199663629, 1691822823829309801, 68865092213424362659, 3034735030143197197435, 144238580771432519823465, 7368717925255301486594525]

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

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