Number of (n+2)X9 binary matrices with every 3X3 block having exactly four 1's.

A181261

Number of (n+2)X9 binary matrices with every 3X3 block having exactly four 1's.

Terms

    a(0) =61398a(1) =74784a(2) =91122a(3) =112500a(4) =162882a(5) =242784a(6) =386406a(7) =750312a(8) =1548594a(9) =3449484a(10) =8634042a(11) =22315320a(12) =59561118a(13) =166095504a(14) =468837162a(15) =1339623540a(16) =3893978322a(17) =11377279584a(18) =33414823926a(19) =98854539192a(20) =293124225474a(21) =871179943644

External references