Number of identity bracelets of n beads of 5 colors.

Terms

a(0) =5a(1) =10a(2) =10a(3) =45a(4) =252a(5) =1120a(6) =5270a(7) =23475a(8) =106950a(9) =483504a(10) =2211650a(11) =10148630a(12) =46911060a(13) =217863040a(14) =1017057256a(15) =4767774375a(16) =22438419120a(17) =105960830300a(18) =501928967930