Triangle read by rows, T(n,k) = T(n-1,k) + T(n-2,k) + T(n-1,k-1) + T(n-2,k-1) and T(0,0) = 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =1a(6) =3a(7) =7a(8) =5a(9) =1a(10) =5a(11) =15a(12) =16a(13) =7a(14) =1a(15) =8a(16) =30a(17) =43a(18) =29a(19) =9a(20) =1a(21) =13a(22) =58a(23) =104a(24) =95a(25) =46a(26) =11a(27) =1a(28) =21a(29) =109