Expansion of 1/(1-3x+3x^3) in powers of x.

Terms

a(0) =1a(1) =3a(2) =9a(3) =24a(4) =63a(5) =162a(6) =414a(7) =1053a(8) =2673a(9) =6777a(10) =17172a(11) =43497a(12) =110160a(13) =278964a(14) =706401a(15) =1788723a(16) =4529277a(17) =11468628a(18) =29039715a(19) =73531314a(20) =186188058a(21) =471445029a(22) =1193741145a(23) =3022659261a(24) =7653642696a(25) =19379704653a(26) =49071136176a(27) =124252480440