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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.

A189176 Row sums of the Riordan matrix (1+x/sqrt(1-4*x),(1-sqrt(1-4*x))/2) (A189175).

Table of values

n a(n)
0 1
1 2
2 5
3 15
4 49
5 168
6 594
7 2145
8 7865
9 29172
10 109174
11 411502
12 1560090
13 5943200
14 22732740
15 87253605
16 335897865
17 1296447900
18 5015206350
19 19439895090
20 75487384830
21 293595204240
22 1143532045500
23 4459774977450
24 17413705988874
25 68067249620328
26 266326619546204

List of values

[1, 2, 5, 15, 49, 168, 594, 2145, 7865, 29172, 109174, 411502, 1560090, 5943200, 22732740, 87253605, 335897865, 1296447900, 5015206350, 19439895090, 75487384830, 293595204240, 1143532045500, 4459774977450, 17413705988874, 68067249620328, 266326619546204]

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

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