Start with a single pentagon; at n-th generation add a pentagon at each expandable vertex; a(n) is the sum of all label values at n-th generation. (See comment for construction rules.)

A247619

Start with a single pentagon; at n-th generation add a pentagon at each expandable vertex; a(n) is the sum of all label values at n-th generation. (See comment for construction rules.)

Terms

    a(0) =1a(1) =6a(2) =16a(3) =36a(4) =66a(5) =116a(6) =186a(7) =296a(8) =446a(9) =676a(10) =986a(11) =1456a(12) =2086a(13) =3036a(14) =4306a(15) =6216a(16) =8766a(17) =12596a(18) =17706a(19) =25376a(20) =35606a(21) =50956a(22) =71426a(23) =102136a(24) =143086a(25) =204516a(26) =286426a(27) =409296a(28) =573126a(29) =818876

External references