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

A296322

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

Terms

    a(0) =1a(1) =5a(2) =11a(3) =23a(4) =54a(5) =122a(6) =278a(7) =634a(8) =1438a(9) =3274a(10) =7451a(11) =16943a(12) =38547a(13) =87691a(14) =199477a(15) =453789a(16) =1032300a(17) =2348324a(18) =5342108a(19) =12152500a(20) =27645148a(21) =62888676a(22) =143062485a(23) =325446157a(24) =740342261a(25) =1684169937a(26) =3831239423a(27) =8715507347a(28) =19826499874a(29) =45102377086

External references