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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.

A371779 a(n) = Sum_{k=0..floor(n/3)} binomial(4*n+2,n-3*k).

Table of values

n a(n)
0 1
1 6
2 45
3 365
4 3078
5 26565
6 232831
7 2063235
8 18435021
9 165780758
10 1498533273
11 13603087800
12 123920995101
13 1132284232215
14 10372554403620
15 95233251146671
16 876081280823430
17 8073359613286509
18 74513645742072841
19 688682977876117698
20 6373025238727622277

List of values

[1, 6, 45, 365, 3078, 26565, 232831, 2063235, 18435021, 165780758, 1498533273, 13603087800, 123920995101, 1132284232215, 10372554403620, 95233251146671, 876081280823430, 8073359613286509, 74513645742072841, 688682977876117698, 6373025238727622277]

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

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