Number of 4 dots bracelet partitions of n.

Terms

a(0) =1a(1) =4a(2) =13a(3) =36a(4) =89a(5) =204a(6) =442a(7) =912a(8) =1811a(9) =3480a(10) =6500a(11) =11844a(12) =21117a(13) =36920a(14) =63427a(15) =107244a(16) =178714a(17) =293868a(18) =477321a(19) =766516a(20) =1217968a(21) =1916292a(22) =2987257a(23) =4616520a(24) =7076364a(25) =10763620a(26) =16253303a(27) =24373932a(28) =36312963a(29) =53763672