Numbers of polypentagons with two connected internal vertices (see Cyvin et al. for precise definition).

A122742

Numbers of polypentagons with two connected internal vertices (see Cyvin et al. for precise definition).

Terms

    a(0) =0a(1) =0a(2) =1a(3) =3a(4) =6a(5) =16a(6) =34a(7) =80a(8) =172a(9) =384a(10) =824a(11) =1792a(12) =3824a(13) =8192a(14) =17376a(15) =36864a(16) =77760a(17) =163840a(18) =343936a(19) =720896a(20) =1507072a(21) =3145728a(22) =6553088a(23) =13631488a(24) =28310528a(25) =58720256a(26) =121632768a(27) =251658240a(28) =520089600a(29) =1073741824

External references