A045612 Number of different energy states between two stacked necklaces, each of n positive and n negative charges.

1, 2, 5, 18, 71, 538, 2619, 33052, 233613, 3153926, 24581647

Offset

0,2

Comments

For this sequence, only the distances between the two necklaces are taken into account (that is, distances within a necklace are ignored). - Sean A. Irvine, Mar 18 2021

Links

Table of n, a(n) for n=0..10.

Sean A. Irvine, Java program (github)

Index entries for sequences related to necklaces

Crossrefs

Cf. A045611.

Sequence in context: A268570 A141494 A189843 * A371494 A103940 A162543

Adjacent sequences: A045609 A045610 A045611 * A045613 A045614 A045615

Keyword

nonn,more

Author

Wouter Meeussen

Extensions

a(6)-a(10) from Sean A. Irvine, Mar 18 2021

Status

approved