Number of discordant permutations.

Terms

a(0) =31a(1) =696a(2) =5823a(3) =29380a(4) =108933a(5) =327840a(6) =848380a(7) =1958004a(8) =4130895a(9) =8107024a(10) =14990889a(11) =26372124a(12) =44470165a(13) =72305160a(14) =113897310a(15) =174496828a(16) =260846703a(17) =381480456a(18) =547057075a(19) =770735316a(20) =1068589557a(21) =1460069392a(22) =1968505152a(23) =2621661540