Number of (n+3) X (1+3) 0..1 arrays with each row and column divisible by 9, read as a binary number with top and left being the most significant bits.

A262333

Number of (n+3) X (1+3) 0..1 arrays with each row and column divisible by 9, read as a binary number with top and left being the most significant bits.

Terms

    a(0) =2a(1) =4a(2) =8a(3) =15a(4) =29a(5) =57a(6) =114a(7) =228a(8) =456a(9) =911a(10) =1821a(11) =3641a(12) =7282a(13) =14564a(14) =29128a(15) =58255a(16) =116509a(17) =233017a(18) =466034a(19) =932068a(20) =1864136a(21) =3728271a(22) =7456541a(23) =14913081a(24) =29826162a(25) =59652324a(26) =119304648a(27) =238609295a(28) =477218589a(29) =954437177

External references