Sequences A087800 and A077416 interleaved.

Terms

a(0) =2a(1) =1a(2) =12a(3) =13a(4) =142a(5) =155a(6) =1692a(7) =1847a(8) =20162a(9) =22009a(10) =240252a(11) =262261a(12) =2862862a(13) =3125123a(14) =34114092a(15) =37239215a(16) =406506242a(17) =443745457a(18) =4843960812a(19) =5287706269a(20) =57721023502a(21) =63008729771a(22) =687808321212a(23) =750817050983