Number of n X 6 0..1 arrays with rows unimodal and columns nondecreasing.

Terms

a(0) =22a(1) =148a(2) =610a(3) =1897a(4) =4900a(5) =11088a(6) =22716a(7) =43065a(8) =76714a(9) =129844a(10) =210574a(11) =329329a(12) =499240a(13) =736576a(14) =1061208a(15) =1497105a(16) =2072862a(17) =2822260a(18) =3784858a(19) =5006617a(20) =6540556a(21) =8447440a(22) =10796500a(23) =13666185a(24) =17144946a(25) =21332052a(26) =26338438a(27) =32287585a(28) =39316432