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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.

A337641 One-quarter of the number of regions in the central square of an equal-armed cross with arms of length n (as in A331456).

Table of values

n a(n)
0 1
1 14
2 70
3 231
4 576
5 1207
6 2255
7 3883
8 6267
9 9588
10 14088
11 20021
12 27667
13 37306
14 49240
15 63859
16 81517
17 102603
18 127545
19 156769
20 190739
21 229932
22 274898
23 326181
24 384332
25 449878
26 523472
27 605766
28 697380
29 799053
30 911449
31 1035371
32 1171471
33 1320566
34 1483374
35 1660873
36 1853819
37 2063133
38 2289607
39 2534326
40 2798159

List of values

[1, 14, 70, 231, 576, 1207, 2255, 3883, 6267, 9588, 14088, 20021, 27667, 37306, 49240, 63859, 81517, 102603, 127545, 156769, 190739, 229932, 274898, 326181, 384332, 449878, 523472, 605766, 697380, 799053, 911449, 1035371, 1171471, 1320566, 1483374, 1660873, 1853819, 2063133, 2289607, 2534326, 2798159]

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

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