Number of (not necessarily maximal) cliques in the n-sun graph.

Terms

a(0) =6a(1) =12a(2) =20a(3) =32a(4) =52a(5) =88a(6) =156a(7) =288a(8) =548a(9) =1064a(10) =2092a(11) =4144a(12) =8244a(13) =16440a(14) =32828a(15) =65600a(16) =131140a(17) =262216a(18) =524364a(19) =1048656a(20) =2097236a(21) =4194392a(22) =8388700a(23) =16777312a(24) =33554532a(25) =67108968a(26) =134217836a(27) =268435568a(28) =536871028a(29) =1073741944