

A213363


Total number of pairs of states of the first n subshells of the nuclear shell model in which the subshells are ordered by energy level in increasing order.


7



1, 3, 4, 7, 8, 10, 14, 16, 19, 20, 25, 28, 32, 33, 35, 41, 45, 47, 54, 59, 60, 63, 68, 74, 82, 85, 86, 90, 92
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OFFSET

1,2


COMMENTS

First differs from A212123 at a(12).


LINKS

Table of n, a(n) for n=1..29.


FORMULA

a(n) = A213364(n)/2.


EXAMPLE

Written as an irregular triangle in which row j is related to the jth shell of nucleus. Note that row 4 has only one term. Triangle begins:
1;
3, 4;
7, 8, 10;
14;
16, 19, 20, 25;
28, 32, 33, 35, 41;
45, 47, 54, 59, 60, 63;
68, 74, 82, 85, 86, 90, 92;
...


CROSSREFS

Partial sums of A213361. Other versions are A210983, A212013, A213373.
Cf. A018226, A212121A212124, A213362, A213364.
Sequence in context: A032788 A338733 A210983 * A212123 A213373 A332059
Adjacent sequences: A213360 A213361 A213362 * A213364 A213365 A213366


KEYWORD

nonn,tabf,hard,more


AUTHOR

Omar E. Pol, Jun 23 2012


STATUS

approved



