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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.

A361715 a(n) = Sum_{k = 0..n-1} binomial(n,k)^2*binomial(n+k-1,k).

Table of values

n a(n)
0 0
1 1
2 9
3 82
4 745
5 6876
6 64764
7 621860
8 6070761
9 60085720
10 601493134
11 6078225792
12 61907445340
13 634751002718
14 6545478537810
15 67830084149832
16 705950951578089
17 7375212511115184
18 77310175072063914
19 812839577957617640
20 8569327793354169870
21 90562666708303706642
22 959212007563384494522
23 10180245921386807485152

List of values

[0, 1, 9, 82, 745, 6876, 64764, 621860, 6070761, 60085720, 601493134, 6078225792, 61907445340, 634751002718, 6545478537810, 67830084149832, 705950951578089, 7375212511115184, 77310175072063914, 812839577957617640, 8569327793354169870, 90562666708303706642, 959212007563384494522, 10180245921386807485152]

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

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