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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.

A371743 a(n) = Sum_{k=0..floor(n/2)} binomial(4*n-k,n-2*k).

Table of values

n a(n)
0 1
1 4
2 29
3 231
4 1926
5 16491
6 143683
7 1267395
8 11282393
9 101151544
10 912011633
11 8260998772
12 75115815749
13 685232639419
14 6268299350776
15 57478389714473
16 528167137069958
17 4862304525663579
18 44836026545219765
19 414048025058547788
20 3828677665694353049

List of values

[1, 4, 29, 231, 1926, 16491, 143683, 1267395, 11282393, 101151544, 912011633, 8260998772, 75115815749, 685232639419, 6268299350776, 57478389714473, 528167137069958, 4862304525663579, 44836026545219765, 414048025058547788, 3828677665694353049]

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

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