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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.

A120139 a(n) = 11 + floor( (1 + Sum_{j=1..n-1} a(j)) / 2).

Table of values

n a(n)
1 11
2 17
3 25
4 38
5 57
6 85
7 128
8 192
9 288
10 432
11 648
12 972
13 1458
14 2187
15 3280
16 4920
17 7380
18 11070
19 16605
20 24908
21 37362
22 56043
23 84064
24 126096
25 189144
26 283716
27 425574
28 638361
29 957542
30 1436313
31 2154469
32 3231704
33 4847556
34 7271334
35 10907001
36 16360501

List of values

[11, 17, 25, 38, 57, 85, 128, 192, 288, 432, 648, 972, 1458, 2187, 3280, 4920, 7380, 11070, 16605, 24908, 37362, 56043, 84064, 126096, 189144, 283716, 425574, 638361, 957542, 1436313, 2154469, 3231704, 4847556, 7271334, 10907001, 16360501]

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

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