Number of n X 2 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.

A201347

Number of n X 2 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.

Terms

    a(0) =2a(1) =4a(2) =8a(3) =14a(4) =23a(5) =36a(6) =54a(7) =78a(8) =109a(9) =148a(10) =196a(11) =254a(12) =323a(13) =404a(14) =498a(15) =606a(16) =729a(17) =868a(18) =1024a(19) =1198a(20) =1391a(21) =1604a(22) =1838a(23) =2094a(24) =2373a(25) =2676a(26) =3004a(27) =3358a(28) =3739a(29) =4148

External references