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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.

A246875 a(n) = (Sum_{k=0..n-1} C(n-1,k)^2*C(-n-1,k)^2/C(k+2,2))/n.

Table of values

n a(n)
1 1
2 2
3 13
4 134
5 1783
6 27950
7 491335
8 9401390
9 192033565
10 4131488426
11 92723165533
12 2155279960586
13 51602299168639
14 1267128734047142
15 31803430252162579
16 813628992468938750
17 21168533016938471665
18 559044288633621863810
19 14962460440143262653685
20 405299365266569619086462

List of values

[1, 2, 13, 134, 1783, 27950, 491335, 9401390, 192033565, 4131488426, 92723165533, 2155279960586, 51602299168639, 1267128734047142, 31803430252162579, 813628992468938750, 21168533016938471665, 559044288633621863810, 14962460440143262653685, 405299365266569619086462]

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

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