Related to enumeration of rooted catapolyoctagons (see Cyvin reference for precise definition).

A121118

Related to enumeration of rooted catapolyoctagons (see Cyvin reference for precise definition).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =7a(4) =14a(5) =47a(6) =100a(7) =340a(8) =756a(9) =2605a(10) =5972a(11) =20799a(12) =48750a(13) =171218a(14) =408088a(15) =1442943a(16) =3484480a(17) =12388309a(18) =30231806a(19) =107971435a(20) =265768846a(21) =952810089a(22) =2362256162a(23) =8496532384a(24) =21193912716a(25) =76443985912a(26) =191684088026a(27) =693071685268

External references