cp's OEIS Frontend

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.

A351857 Number of nonnegative integer solutions to n = x_1 + x_2 + ... + x_(2*n) + 2*y_1 + 2*y_2 + ... + 2*y_(2*n).

Table of values

n a(n)
1 2
2 14
3 92
4 654
5 4752
6 35204
7 264112
8 2000526
9 15264866
10 117161264
11 903533380
12 6995547780
13 54343476072
14 423360920528
15 3306313730592
16 25876855432846
17 202909132368942
18 1593755466338030
19 12537009118650016
20 98753463725849904
21 778825917274945408
22 6149069826564738780

List of values

[2, 14, 92, 654, 4752, 35204, 264112, 2000526, 15264866, 117161264, 903533380, 6995547780, 54343476072, 423360920528, 3306313730592, 25876855432846, 202909132368942, 1593755466338030, 12537009118650016, 98753463725849904, 778825917274945408, 6149069826564738780]

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

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