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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.

A290908 p-INVERT of the positive integers, where p(S) = 1 - 4*S^2.

Table of values

n a(n)
0 0
1 4
2 16
3 56
4 208
5 780
6 2912
7 10864
8 40544
9 151316
10 564720
11 2107560
12 7865520
13 29354524
14 109552576
15 408855776
16 1525870528
17 5694626340
18 21252634832
19 79315912984
20 296011017104
21 1104728155436
22 4122901604640
23 15386878263120
24 57424611447840
25 214311567528244

List of values

[0, 4, 16, 56, 208, 780, 2912, 10864, 40544, 151316, 564720, 2107560, 7865520, 29354524, 109552576, 408855776, 1525870528, 5694626340, 21252634832, 79315912984, 296011017104, 1104728155436, 4122901604640, 15386878263120, 57424611447840, 214311567528244]

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

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