Triangle read by rows: numbers of nonintersecting circles, one marked.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =1a(6) =5a(7) =5a(8) =2a(9) =1a(10) =13a(11) =13a(12) =6a(13) =2a(14) =1a(15) =35a(16) =35a(17) =16a(18) =6a(19) =2a(20) =1a(21) =95a(22) =95a(23) =46a(24) =17a(25) =6a(26) =2a(27) =1a(28) =262a(29) =262