Diagonal sums of the number triangle associated to A086617.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =14a(7) =24a(8) =43a(9) =78a(10) =144a(11) =269a(12) =509a(13) =971a(14) =1868a(15) =3618a(16) =7049a(17) =13805a(18) =27162a(19) =53661a(20) =106405a(21) =211697a(22) =422458a(23) =845386a(24) =1696017a(25) =3410522a(26) =6873060a(27) =13878721a(28) =28077439a(29) =56900936