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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.

A371756 a(n) = Sum_{k=0..floor(n/3)} binomial(5*n-2*k,n-3*k).

Table of values

n a(n)
0 1
1 5
2 45
3 456
4 4863
5 53383
6 597052
7 6765471
8 77407257
9 892270250
10 10346070471
11 120542238796
12 1410040212166
13 16549315766244
14 194792566133507
15 2298472850258746
16 27179673132135409
17 322013956853586970
18 3821532498419234994
19 45420775578132979989

List of values

[1, 5, 45, 456, 4863, 53383, 597052, 6765471, 77407257, 892270250, 10346070471, 120542238796, 1410040212166, 16549315766244, 194792566133507, 2298472850258746, 27179673132135409, 322013956853586970, 3821532498419234994, 45420775578132979989]

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

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