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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.

A277060 a(n) = (1/2) * Sum_{k=0..n} (binomial(n,k) * binomial(n+k,k+1))^2 for n >= 0.

Table of values

n a(n)
0 0
1 1
2 28
3 729
4 19376
5 529575
6 14835780
7 424231465
8 12338211520
9 363931754949
10 10862528888300
11 327501958094003
12 9959845931792784
13 305175084350065267
14 9412306255856822388
15 291982561878565118025
16 9104382992541189221120

List of values

[0, 1, 28, 729, 19376, 529575, 14835780, 424231465, 12338211520, 363931754949, 10862528888300, 327501958094003, 9959845931792784, 305175084350065267, 9412306255856822388, 291982561878565118025, 9104382992541189221120]

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

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