A statistic on orbital systems over n sectors: the number of orbitals with k peaks.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =2a(5) =4a(6) =2a(7) =12a(8) =15a(9) =3a(10) =10a(11) =8a(12) =2a(13) =38a(14) =68a(15) =30a(16) =4a(17) =26a(18) =30a(19) =12a(20) =2a(21) =121a(22) =272a(23) =183a(24) =49a(25) =5a(26) =70a(27) =104a(28) =60a(29) =16