Erroneous version of A134915.

Terms

a(0) =1a(1) =2a(2) =8a(3) =27a(4) =86a(5) =272a(6) =856a(7) =2691a(8) =8456a(9) =26567a(10) =83464a(11) =262212a(12) =823765a(13) =2587936a(14) =8130242a(15) =25541910a(16) =80242278a(17) =252088553a(18) =791959548a(19) =2488014300a(20) =7816327449a(21) =24555716893a(22) =77144059796a(23) =242355211525