Number of 3-sided prudent polygons of area n.

Terms

a(0) =6a(1) =10a(2) =20a(3) =42a(4) =92a(5) =204a(6) =454a(7) =1010a(8) =2242a(9) =4962a(10) =10946a(11) =24066a(12) =52736a(13) =115186a(14) =250800a(15) =544432a(16) =1178432a(17) =2543712a(18) =5476352a(19) =11760642a(20) =25196566a(21) =53861008a(22) =114889430a(23) =244571174a(24) =519630462a(25) =1102021562a(26) =2333088968a(27) =4931232086a(28) =10406327848a(29) =21927562520