Number of conjugated cycles composed of six carbons in (1,1)-nanotubes in terms of the number of naphthalene units.
A121257
Number of conjugated cycles composed of six carbons in (1,1)-nanotubes in terms of the number of naphthalene units.
Terms
- a(0) =4a(1) =20a(2) =76a(3) =260a(4) =840a(5) =2616a(6) =7940a(7) =23644a(8) =69380a(9) =201220a(10) =578064a(11) =1647600a(12) =4664836a(13) =13132580a(14) =36789820a(15) =102621956a(16) =285174360a(17) =789810984a(18) =2180889860a(19) =6005842540a(20) =16498958324a(21) =45225010180a(22) =123715684896a(23) =337806904800a(24) =920819997700
External references
- oeis: A121257