A 'Morgan Voyce' transform of A007854.

Terms

a(0) =1a(1) =4a(2) =22a(3) =130a(4) =790a(5) =4870a(6) =30274a(7) =189202a(8) =1186702a(9) =7461982a(10) =47007034a(11) =296527162a(12) =1872479350a(13) =11833642006a(14) =74833075570a(15) =473463268642