Number of permutations of [n] avoiding {4213, 1432, 1324}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =74a(6) =249a(7) =797a(8) =2451a(9) =7318a(10) =21380a(11) =61449a(12) =174378a(13) =489827a(14) =1364499a(15) =3774779a(16) =10381722a(17) =28410568a(18) =77414615a(19) =210156558a(20) =568645563a(21) =1534219643a(22) =4128788739a(23) =11085822020a(24) =29704820778a(25) =79449163033a(26) =212145068252a(27) =565621458225