Number of discordant permutations.

Terms

a(0) =13a(1) =192a(2) =1085a(3) =3880a(4) =10656a(5) =24626a(6) =50380a(7) =94128a(8) =163943a(9) =270004a(10) =424839a(11) =643568a(12) =944146a(13) =1347606a(14) =1878302a(15) =2564152a(16) =3436881a(17) =4532264a(18) =5890369a(19) =7555800a(20) =9577940a(21) =12011194a(22) =14915232a(23) =18355232a(24) =22402123a(25) =27132828a(26) =32630507a(27) =38984800a(28) =46292070