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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.

A371775 a(n) = Sum_{k=0..floor(n/3)} binomial(4*n-k+1,n-3*k).

Table of values

n a(n)
0 1
1 5
2 36
3 287
4 2396
5 20539
6 179125
7 1581282
8 14085997
9 126357958
10 1139825257
11 10328791996
12 93951594230
13 857328996139
14 7844767641718
15 71951952863375
16 661311093597592
17 6089245462608316
18 56160004711457917
19 518707264791838694
20 4797177987838607105

List of values

[1, 5, 36, 287, 2396, 20539, 179125, 1581282, 14085997, 126357958, 1139825257, 10328791996, 93951594230, 857328996139, 7844767641718, 71951952863375, 661311093597592, 6089245462608316, 56160004711457917, 518707264791838694, 4797177987838607105]

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

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