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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.

A357569 a(n) = binomial(3*n,n)^2 - 27*binomial(2*n,n).

Table of values

n a(n)
0 -26
1 -45
2 63
3 6516
4 243135
5 9011205
6 344597148
7 13520945736
8 540917244351
9 21966327267885
10 902702921361813
11 37456461969311736
12 1566697064604277788
13 65973795093057780936
14 2794203818388994498200
15 118933541228931589568016
16 5084343623375039833670079
17 218184481964802862563857685

List of values

[-26, -45, 63, 6516, 243135, 9011205, 344597148, 13520945736, 540917244351, 21966327267885, 902702921361813, 37456461969311736, 1566697064604277788, 65973795093057780936, 2794203818388994498200, 118933541228931589568016, 5084343623375039833670079, 218184481964802862563857685]

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

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