Number of (n+1) X 6 0..2 arrays with all 2 X 2 subblock sums the same.

Terms

a(0) =2025a(1) =2691a(2) =3793a(3) =6111a(4) =10449a(5) =19935a(6) =39697a(7) =85431a(8) =190305a(9) =450111a(10) =1098433a(11) =2812551a(12) =7386129a(13) =20098095a(14) =55623217a(15) =157619511a(16) =451006785a(17) =1309524831a(18) =3821415073a(19) =11250418791a(20) =33202564209a(21) =98511527055a(22) =292616203537