Golden Triangle sums: a(n) = a(n-1) + A001654(n+1) with a(0)=0.

Terms

a(0) =0a(1) =2a(2) =8a(3) =23a(4) =63a(5) =167a(6) =440a(7) =1154a(8) =3024a(9) =7919a(10) =20735a(11) =54287a(12) =142128a(13) =372098a(14) =974168a(15) =2550407a(16) =6677055a(17) =17480759a(18) =45765224a(19) =119814914a(20) =313679520a(21) =821223647a(22) =2149991423a(23) =5628750623a(24) =14736260448a(25) =38580030722a(26) =101003831720