A213373 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, 29, 32, 38, 40, 41, 45, 50, 57, 59, 62, 63

Offset

1,2

Comments

First differs from A212123 at a(14). For more information see A213372.

Links

Table of n, a(n) for n=1..22.

MIT OpenCourseWare, Energy Levels of Nucleons in a Smoothly-Varying Potential Well

Formula

a(n) = A213374(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;
29, 32, 38, 40, 41;
45, 50, 57, 59, 62, 63;
...

Crossrefs

Partial sums of A213371. Other versions are A210983, A212013, A212123, A213363.

Cf. A018226, A213372, A213374.

Sequence in context: A210983 A213363 A212123 * A363353 A332059 A229081

Adjacent sequences: A213370 A213371 A213372 * A213374 A213375 A213376

Keyword

nonn,tabf,hard,more

Author

Omar E. Pol, Jul 16 2012

Status

approved