a(n) = T(n,n) + T(n,m+1) + ... + T(n,n), where m=[ (n+2)/2 ], T given by A027011.

Terms

a(0) =1a(1) =1a(2) =6a(3) =7a(4) =36a(5) =56a(6) =181a(7) =317a(8) =826a(9) =1531a(10) =3576a(11) =6832a(12) =15021a(13) =29201a(14) =61966a(15) =121727a(16) =252796a(17) =499816a(18) =1024101a(19) =2033077a(20) =4130226a(21) =8220851a(22) =16609456a(23) =33115232a(24) =66669661a(25) =133067881a(26) =267285606a(27) =533860567a(28) =1070731476a(29) =2139602456