Erroneous version of A047709.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =12a(5) =4a(6) =129a(7) =122a(8) =1332a(9) =960a(10) =10919a(11) =11372a(12) =132900a(13) =126396a(14) =1299851a(15) =1349784