Number of catacondensed hexagonal systems with n hexagons.

A121286

Number of catacondensed hexagonal systems with n hexagons.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =26a(4) =72a(5) =192a(6) =496a(7) =1248a(8) =3072a(9) =7424a(10) =17664a(11) =41472a(12) =96256a(13) =221184a(14) =503808a(15) =1130496a(16) =2555904a(17) =5701632

External references