Diagonal sums of triangle A182013.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =26a(5) =60a(6) =145a(7) =353a(8) =884a(9) =2241a(10) =5786a(11) =15108a(12) =39941a(13) =106558a(14) =286809a(15) =777505a(16) =2121668a(17) =5822287a(18) =16059288a(19) =44494738a(20) =123782207a(21) =345615047a(22) =968211110a(23) =2720561790a(24) =7665640267a(25) =21654105734a(26) =61312389677a(27) =173978404587a(28) =494667697706