1/12 the number of (n+2)X3 0..2 arrays with each 3X3 subblock containing one of one value, three of another, and five of the last.

A184499

1/12 the number of (n+2)X3 0..2 arrays with each 3X3 subblock containing one of one value, three of another, and five of the last.

Terms

    a(0) =252a(1) =1248a(2) =6132a(3) =30024a(4) =149112a(5) =736200a(6) =3618864a(7) =17994960a(8) =88970832a(9) =437998752a(10) =2179485792a(11) =10786403232a(12) =53164931904a(13) =264710389824

External references