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

Author

Omar E. Pol, Jul 16 2012

Keywords

• nonn
• tabf
• hard
• more

Comments

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

Examples

			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;
...
		

Links

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

Crossrefs

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

Cf. A018226, A213372, A213374.

Formula

a(n) = A213374(n)/2.