First occurrence of n in A225099, or -1 if n does not appear in A225099.

Terms

a(0) =0a(1) =12a(2) =36a(3) =370a(4) =3770a(5) =12410a(6) =202130a(7) =197210a(8) =81770a(9) =9151610a(10) =16046810a(11) =12625730a(12) =21899930a(13) =95336930a(14) =9549410a(15) =416392730a(16) =1016275130a(17) =338609570a(18) =789396530a(19) =601741010a(20) =254885930a(21) =10083683090a(22) =4690939370a(23) =29207671610a(24) =30431277890a(25) =22264417370a(26) =23231920010a(27) =10838858810a(28) =37462976330