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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.

A357671 a(n) = Sum_{k = 0..n} ( binomial(n+k-1,k) + binomial(n+k-1,k)^2 ).

Table of values

n a(n)
0 2
1 4
2 20
3 166
4 1812
5 22504
6 297362
7 4067298
8 56897300
9 809019580
10 11649254520
11 169444978124
12 2485270719570
13 36707044807996
14 545386321069862
15 8144809732228666
16 122177690210103060
17 1839933274439787940
18 27804610626798500372
19 421476329345312885304
20 6406685025104178888312

List of values

[2, 4, 20, 166, 1812, 22504, 297362, 4067298, 56897300, 809019580, 11649254520, 169444978124, 2485270719570, 36707044807996, 545386321069862, 8144809732228666, 122177690210103060, 1839933274439787940, 27804610626798500372, 421476329345312885304, 6406685025104178888312]

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

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