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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.

A244867 Let G denote the 9-node, 16-edge graph formed from an octagon with main diagonals drawn and a node at the center; a(n) = number of magic labelings of G with magic sum 2n.

Table of values

n a(n)
0 1
1 32
2 320
3 1784
4 7040
5 22104
6 58980
7 139320
8 299343
9 596200
10 1115972
11 1983488
12 3374150
13 5527952
14 8765880
15 13508880
16 20299581
17 29826960
18 42954136
19 60749480
20 84521228
21 115855784
22 156659900
23 209206920
24 276187275
25 360763416
26 466629372
27 598075120
28 760055954
29 958267040
30 1199223344
31 1490345120

List of values

[1, 32, 320, 1784, 7040, 22104, 58980, 139320, 299343, 596200, 1115972, 1983488, 3374150, 5527952, 8765880, 13508880, 20299581, 29826960, 42954136, 60749480, 84521228, 115855784, 156659900, 209206920, 276187275, 360763416, 466629372, 598075120, 760055954, 958267040, 1199223344, 1490345120]

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

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