Number of 3 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s.

A297300

Number of 3 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =5a(4) =9a(5) =17a(6) =32a(7) =60a(8) =113a(9) =213a(10) =401a(11) =755a(12) =1422a(13) =2678a(14) =5043a(15) =9497a(16) =17885a(17) =33681a(18) =63428a(19) =119448a(20) =224945a(21) =423617a(22) =797757a(23) =1502339a(24) =2829210a(25) =5327978a(26) =10033667a(27) =18895437a(28) =35583953a(29) =67011825

External references