Number of n X 2 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300344

Number of n X 2 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =15a(4) =37a(5) =90a(6) =223a(7) =550a(8) =1355a(9) =3341a(10) =8237a(11) =20307a(12) =50064a(13) =123426a(14) =304290a(15) =750185a(16) =1849478a(17) =4559634a(18) =11241151a(19) =27713513a(20) =68323858a(21) =168443083a(22) =415273274a(23) =1023799191a(24) =2524036217a(25) =6222664445a(26) =15341124083a(27) =37821433280a(28) =93243546406

External references