Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300765

Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =15a(2) =33a(3) =91a(4) =247a(5) =728a(6) =2042a(7) =5974a(8) =17545a(9) =51551a(10) =151557a(11) =446408a(12) =1314475a(13) =3869787a(14) =11400978a(15) =33619541a(16) =99210170a(17) =292931867a(18) =865301600a(19) =2556823741a(20) =7556496705a(21) =22335732398a(22) =66027826136a(23) =195206654273a(24) =577164023144

External references