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.

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

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: A032788 A338733 A210983 * A212123 A213373 A363353

Adjacent sequences: A213360 A213361 A213362 * A213364 A213365 A213366

Keyword

nonn,tabf,hard,more

Author

Omar E. Pol, Jun 23 2012

Status

approved