Sums of NE-SW diagonals of triangle A172171.

Terms

a(0) =0a(1) =1a(2) =1a(3) =11a(4) =12a(5) =32a(6) =44a(7) =85a(8) =129a(9) =223a(10) =352a(11) =584a(12) =936a(13) =1529a(14) =2465a(15) =4003a(16) =6468a(17) =10480a(18) =16948a(19) =27437a(20) =44385a(21) =71831a(22) =116216a(23) =188056a(24) =304272a(25) =492337a(26) =796609a(27) =1288955a(28) =2085564a(29) =3374528