Number of n X 3 0..1 arrays with rows, columns, diagonals and antidiagonals unimodal.

Terms

a(0) =7a(1) =49a(2) =218a(3) =726a(4) =2014a(5) =4904a(6) =10797a(7) =21917a(8) =41601a(9) =74635a(10) =127636a(11) =209480a(12) =331776a(13) =509386a(14) =760991a(15) =1109703a(16) =1583723a(17) =2217045a(18) =3050206a(19) =4131082a(20) =5515730a(21) =7269276a(22) =9466849a(23) =12194561a(24) =15550533a(25) =19645967a(26) =24606264a(27) =30572188a(28) =37701076a(29) =46168094