Sums of NW-SE diagonals of triangle A172171.

Terms

a(0) =0a(1) =1a(2) =10a(3) =20a(4) =39a(5) =68a(6) =116a(7) =193a(8) =318a(9) =520a(10) =847a(11) =1376a(12) =2232a(13) =3617a(14) =5858a(15) =9484a(16) =15351a(17) =24844a(18) =40204a(19) =65057a(20) =105270a(21) =170336a(22) =275615a(23) =445960a(24) =721584a(25) =1167553a(26) =1889146a(27) =3056708a(28) =4945863a(29) =8002580