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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 (list; graph; refs; listen; history; text; internal format)
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 j-th 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, A212121-A212124, A213362, A213364.

Sequence in context: A153144 A032788 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

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Last modified August 10 11:52 EDT 2020. Contains 336379 sequences. (Running on oeis4.)