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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.

A371744 a(n) = Sum_{k=0..floor(n/2)} binomial(5*n-k,n-2*k).

Table of values

n a(n)
0 1
1 5
2 46
3 469
4 5017
5 55177
6 617905
7 7008264
8 80241790
9 925457822
10 10735707149
11 125128265025
12 1464140655619
13 17188834766497
14 202366206841241
15 2388313959181973
16 28246993739096305
17 334711010978735163
18 3972765235517468758
19 47224110710958716845

List of values

[1, 5, 46, 469, 5017, 55177, 617905, 7008264, 80241790, 925457822, 10735707149, 125128265025, 1464140655619, 17188834766497, 202366206841241, 2388313959181973, 28246993739096305, 334711010978735163, 3972765235517468758, 47224110710958716845]

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

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