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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.

A193047 Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.

Table of values

n a(n)
0 0
1 1
2 2
3 19
4 102
5 377
6 1104
7 2777
8 6282
9 13155
10 25998
11 49153
12 89792
13 159681
14 278034
15 476131
16 804790
17 1346457
18 2234768
19 3686201
20 6051290
21 9897491
22 16143262
23 26275009
24 42698112
25 69304897
26 112393634
27 182155507
28 295080582
29 477850745

List of values

[0, 1, 2, 19, 102, 377, 1104, 2777, 6282, 13155, 25998, 49153, 89792, 159681, 278034, 476131, 804790, 1346457, 2234768, 3686201, 6051290, 9897491, 16143262, 26275009, 42698112, 69304897, 112393634, 182155507, 295080582, 477850745]

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

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