Sum of unique squarefree numbers in first n rows of Pascal's triangle.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =12a(5) =27a(6) =42a(7) =105a(8) =175a(9) =175a(10) =385a(11) =1408a(12) =1474a(13) =2566a(14) =8677a(15) =15607a(16) =15607a(17) =39934a(18) =39934a(19) =133300a(20) =264305a(21) =559565a(22) =1288392a(23) =5482695a(24) =5493321a(25) =5546451a(26) =11088442a(27) =11088442a(28) =24211552a(29) =88854292