Number of (n+2)X6 binary matrices with every 3X3 block having exactly four 1's.

A181258

Number of (n+2)X6 binary matrices with every 3X3 block having exactly four 1's.

Terms

    a(0) =2484a(1) =3942a(2) =6360a(3) =10818a(4) =22512a(5) =48846a(6) =112500a(7) =289830a(8) =764832a(9) =2072106a(10) =5854728a(11) =16700214a(12) =48109644a(13) =140771982a(14) =413533560a(15) =1219726098a(16) =3620006112a(17) =10762255326a(18) =32052060900a(19) =95704407030a(20) =285982189392a(21) =855223829946

External references