Number of (n+2)X4 binary matrices with every 3X3 block having exactly four 1's.

A181256

Number of (n+2)X4 binary matrices with every 3X3 block having exactly four 1's.

Terms

    a(0) =336a(1) =746a(2) =1684a(3) =3942a(4) =10348a(5) =27554a(6) =74784a(7) =212570a(8) =608476a(9) =1755630a(10) =5152996a(11) =15171626a(12) =44814936a(13) =133231586a(14) =396621844a(15) =1182345462a(16) =3533450908a(17) =10565961074a(18) =31613799504a(19) =94685091050a(20) =283660310476a(21) =850017916350

External references