cp's OEIS Frontend

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.

A194811 Number of grid points that are covered after n-th stage of A139250 version "Tree", starting with a(0) = 1 and assuming the toothpicks have length 4, 3, and 2.

Table of values

n a(n)
0 1
1 5
2 13
3 25
4 37
5 53
6 81
7 113
8 133
9 149
10 177
11 213
12 253
13 313
14 401
15 481
16 517
17 533
18 561
19 597
20 637
21 697
22 785
23 869
24 925
25 985
26 1077
27 1189
28 1329
29 1537
30 1793
31 1985
32 2053
33 2069
34 2097
35 2133
36 2173
37 2233
38 2321
39 2405
40 2461
41 2521
42 2613
43 2725
44 2865
45 3073
46 3329
47 3525
48 3613

List of values

[1, 5, 13, 25, 37, 53, 81, 113, 133, 149, 177, 213, 253, 313, 401, 481, 517, 533, 561, 597, 637, 697, 785, 869, 925, 985, 1077, 1189, 1329, 1537, 1793, 1985, 2053, 2069, 2097, 2133, 2173, 2233, 2321, 2405, 2461, 2521, 2613, 2725, 2865, 3073, 3329, 3525, 3613]