4-quantum transitions in systems of N>=4 spin 1/2 particles, in columns by combination indices.

Terms

a(0) =1a(1) =10a(2) =60a(3) =6a(4) =280a(5) =84a(6) =1120a(7) =672a(8) =28a(9) =4032a(10) =4032a(11) =504a(12) =13440a(13) =20160a(14) =5040a(15) =120a(16) =42240a(17) =88704a(18) =36960a(19) =2640a(20) =126720a(21) =354816a(22) =221760a(23) =31680a(24) =495a(25) =366080a(26) =1317888a(27) =1153152a(28) =274560a(29) =12870