Third entry in row n of triangle in A169945.

Terms

a(0) =1a(1) =3a(2) =8a(3) =16a(4) =29a(5) =49a(6) =82a(7) =130a(8) =205a(9) =305a(10) =450a(11) =654a(12) =947a(13) =1343a(14) =1902a(15) =2648a(16) =3675a(17) =5015a(18) =6824a(19) =9166a(20) =12343a(21) =16393a(22) =21762a(23) =28682a(24) =37695a(25) =49055a(26) =63892a(27) =82610a(28) =106691a(29) =136643