Erroneous version of A342587.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =12a(5) =6a(6) =1a(7) =86a(8) =108a(9) =24a(10) =1a(11) =840a(12) =2310a(13) =960a(14) =120a(15) =1a(16) =11642a(17) =65700a(18) =42960a(19) =9000a(20) =720a(21) =1a(22) =227892a(23) =2583126a(24) =2510760a(25) =712320a(26) =90720a(27) =5040a(28) =1a(29) =6285806