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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.

A085812 Sum(sum(binomial(i,j),i=n..2*n),j=0..n).

Table of values

n a(n)
0 1
1 5
2 22
3 91
4 366
5 1454
6 5748
7 22691
8 89590
9 354010
10 1400268
11 5544334
12 21973420
13 87158972
14 345977832
15 1374249251
16 5461704870
17 21717305762
18 86391846492
19 343800647066
20 1368639516420
21 5450093895812
22 21708897213912
23 86492537630606

List of values

[1, 5, 22, 91, 366, 1454, 5748, 22691, 89590, 354010, 1400268, 5544334, 21973420, 87158972, 345977832, 1374249251, 5461704870, 21717305762, 86391846492, 343800647066, 1368639516420, 5450093895812, 21708897213912, 86492537630606]

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

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