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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.

A371753 a(n) = Sum_{k=0..floor(n/2)} binomial(5*n-2*k-1,n-2*k).

Table of values

n a(n)
0 1
1 4
2 37
3 376
4 4013
5 44064
6 492871
7 5585080
8 63901421
9 736575316
10 8540549322
11 99503540008
12 1163910870767
13 13660217796736
14 160782910480936
15 1897131524755896
16 22433316399634669
17 265775992115557076
18 3154067508987675679
19 37487016824453703920
20 446148092364247390618

List of values

[1, 4, 37, 376, 4013, 44064, 492871, 5585080, 63901421, 736575316, 8540549322, 99503540008, 1163910870767, 13660217796736, 160782910480936, 1897131524755896, 22433316399634669, 265775992115557076, 3154067508987675679, 37487016824453703920, 446148092364247390618]

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

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