The total number of pentagons in a variant of pentagon expansion (side-to-side, two consecutive sides and one isolated side) after n iterations.

A253687

The total number of pentagons in a variant of pentagon expansion (side-to-side, two consecutive sides and one isolated side) after n iterations.

Terms

    a(0) =1a(1) =4a(2) =10a(3) =21a(4) =39a(5) =64a(6) =94a(7) =129a(8) =167a(9) =212a(10) =262a(11) =317a(12) =375a(13) =440a(14) =510a(15) =585a(16) =663a(17) =748a(18) =838a(19) =933a(20) =1031a(21) =1136a(22) =1246a(23) =1361a(24) =1479a(25) =1604a(26) =1734a(27) =1869a(28) =2007a(29) =2152

External references