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

Terms

a(0) =7a(1) =49a(2) =240a(3) =876a(4) =2582a(5) =6504a(6) =14547a(7) =29659a(8) =56161a(9) =100123a(10) =169786a(11) =276030a(12) =432888a(13) =658106a(14) =973749a(15) =1406853a(16) =1990123a(17) =2762677a(18) =3770836a(19) =5068960a(20) =6720330a(21) =8798076a(22) =11386151a(23) =14580351a(24) =18489381a(25) =23235967a(26) =28958014a(27) =35809810a(28) =43963276a(29) =53609262