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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.

A212121 Triangle read by rows in which row n lists the number of pairs of states of the subshells of the n-th shell of the nuclear shell model ordered by energy level in increasing order.

Table of values

n a(n)
1 1
2 2
3 1
4 3
5 1
6 2
7 4
8 2
9 3
10 1
11 5
12 4
13 3
14 2
15 1
16 6
17 5
18 4
19 3
20 2
21 1
22 7
23 5
24 3
25 6
26 4
27 1
28 2
29 8

List of values

[1, 2, 1, 3, 1, 2, 4, 2, 3, 1, 5, 4, 3, 2, 1, 6, 5, 4, 3, 2, 1, 7, 5, 3, 6, 4, 1, 2, 8]

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

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