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A213371
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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.
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5
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1, 2, 1, 3, 1, 2, 4, 2, 3, 1, 5, 4, 3, 6, 2, 1, 4, 5, 7, 2, 3, 1
(list;
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listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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First differs from A212121 at a(14). The illustration of initial terms is essentially the same as the illustration of initial terms of A213372, the main entry for this sequence.
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LINKS
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FORMULA
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EXAMPLE
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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;
4, 3, 6, 2, 1;
4, 5, 7, 2, 3, 1;
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CROSSREFS
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KEYWORD
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nonn,tabf,hard,more
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AUTHOR
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STATUS
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approved
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