Number of n element multisets of the 2n-th roots of unity with zero sum.
A321415
Number of n element multisets of the 2n-th roots of unity with zero sum.
Terms
- a(0) =0a(1) =2a(2) =2a(3) =10a(4) =2a(5) =64a(6) =2a(7) =330a(8) =1028a(9) =2010a(10) =2a(11) =24216a(12) =2a(13) =77528a(14) =964696a(15) =490314a(16) =2a(17) =11437750a(18) =2a(19) =21390330
External references
- oeis: A321415