Number of nX2 0,1 arrays with adjacent row and column sums unequal.

Terms

a(0) =2a(1) =8a(2) =20a(3) =44a(4) =116a(5) =332a(6) =900a(7) =2268a(8) =5716a(9) =14892a(10) =39268a(11) =101820a(12) =260532a(13) =668300a(14) =1727812a(15) =4469404a(16) =11506196a(17) =29540332a(18) =75933220a(19) =195497084a(20) =503093108a(21) =1292802636a(22) =3320226820a(23) =8530094940a(24) =21919963604a(25) =56309625260a(26) =144586811108