Illustration of initial terms: two views of a three-dimensional shell model of nucleus.
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.|-------------------------- j --------------------------|
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.| |---------------------- i ----------------------| |
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.| | |------------------ h ------------------| | |
.| | | | | |
.| | | |-------------- g --------------| | | |
.| | | | | | | |
.| | | | |---------- f ----------| | | | |
.| | | | | | | | | |
.| | | | | |------ d ------| | | | | |
.| | | | | | | | | | | |
.| | | | | | |-- p --| | | | | | |
.| | | | | | | | | | | | | |
.| | | | | | | s | | | | | | |
.| | | | | | | | | | | | | | |
.| | | | | | | 1 | | | | | | |
.| | | | | | 2 | | | | | | | |
.| | | | | | | | 1 | | | | | |
.| | | | | 3 | | | | | | | | |
.| | | | | | | 1 | | | | | | |
.| | | | | | | | | 2 | | | | |
.| | | | 4 | | | | | | | | | |
.| | | | | | 2 | | | | | | | |
.| | | | | | | | | | 3 | | | |
.| | | | | | | | 1 | | | | | |
.| | | 5 | | | | | | | | | | |
.| | | | | 3 | | | | | | | | |
.| | | | | | | | | | | 4 | | |
.| | | | | | | 1 | | | | | | |
.| | | | | | | | | 2 | | | | |
.| | 6 | | | | | | | | | | | |
.| | | | 4 | | | | | | | | | |
.| | | | | | 2 | | | | | | | |
.| 7 | | | | | | | | | | | | |
.| | | | | | | | | | | | 5 | |
.| | | | | | | | 1 | | | | | |
.| | | | | | | | | | 3 | | | |
.| | | 5 | | | | | | | | | | |
.| | | | | | | | | | | | | 6 |
.8 | | | | | | | | | | | | | |
.| | | | | 3 | | | | | | | | |
.| | | | | | | 1 | | | | | | |
.| | | | | | | | | | | 4 | | |
.| | | | | | | | | 2 | | | | |
.| | | | | | | | | | | | | | |
.| | | | | | | |1/2| | | | | | |
.| | | | | | | | | | | | |
.| | | | | | |----3/2----| | | | | |
.| | | | | | | | | | |
.| | | | | |--------5/2--------| | | | |
.| | | | | | | | |
.| | | | |------------7/2------------| | | |
.| | | | | | |
.| | | |----------------9/2----------------| | |
.| | | | |
.| | |-------------------11/2--------------------| |
.| | |
.| |-----------------------13/2------------------------|
.|
.|---------------------------15/2-------------------------
.
..........................................................
.
.|-------------------------- j --------------------------|
.| |
.* |---------------------- i ----------------------| |
.| | | |
.| * |------------------ h ------------------| | *
.| | | | | |
.* | * |-------------- f --------------| | * |
.| | | | | | | |
.| * | * |---------- e ----------| | * | *
.| | | | | | | | | |
.* | * | * |------ d ------| | * | * |
.| | | | | | | | | | | |
.| * | * | * |-- p --| | * | * | *
.| | | | | | | | | | | | | |
.* | * | * | * s | * | * | * |
.| | | | | | | | | | | | | | |
.| * | * | * | * * | * | * | *
.| | | | | | | | | | | | | | |
.* | * | * | * |1/2| * | * | * |
.| | | | | | | | | | | | |
.| * | * | * |----3/2----| * | * | *
.| | | | | | | | | | |
.* | * | * |--------5/2--------| * | * |
.| | | | | | | | |
.| * | * |------------7/2------------| * | *
.| | | | | | |
.* | * |----------------9/2----------------| * |
.| | | | |
.| * |-------------------11/2--------------------| *
.| | |
.* |-----------------------13/2------------------------|
.|
.|---------------------------15/2-------------------------
.
Written as an irregular triangle in which row n represents the n-th shell of nucleus. Note that row 4 has only one term. Triangle begins:
1;
2, 1;
3, 1, 2;
4;
2, 3, 1, 5;
3, 4, 1, 2, 6;
4, 2, 7, 5, 1, 3;
5, 6, 8, 3, 1, 4, 2;
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