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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.

A122737 Expansion of 1 - 3*x - sqrt(1 - 6*x + 5*x^2).

Table of values

n a(n)
1 0
2 2
3 6
4 20
5 72
6 274
7 1086
8 4438
9 18570
10 79174
11 342738
12 1502472
13 6656436
14 29756910
15 134061570
16 608072340
17 2774495160
18 12726088630
19 58646299650
20 271401086380
21 1260750482760
22 5876782098790
23 27479558368170
24 128861594138750
25 605869334122602
26 2855527261156394
27 13488568550452446

List of values

[0, 2, 6, 20, 72, 274, 1086, 4438, 18570, 79174, 342738, 1502472, 6656436, 29756910, 134061570, 608072340, 2774495160, 12726088630, 58646299650, 271401086380, 1260750482760, 5876782098790, 27479558368170, 128861594138750, 605869334122602, 2855527261156394, 13488568550452446]

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

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