Second convolution of A001045(n+1) (generalized (1,2)-Fibonacci), n>=0, with itself.

Terms

a(0) =1a(1) =3a(2) =12a(3) =34a(4) =99a(5) =261a(6) =678a(7) =1692a(8) =4149a(9) =9959a(10) =23568a(11) =55014a(12) =127031a(13) =290457a(14) =658602a(15) =1482240a(16) =3314025a(17) =7365915a(18) =16285300a(19) =35832810a(20) =78500811a(21) =171293293a(22) =372412782a(23) =806963364a(24) =1743173469a(25) =3754782351a(26) =8066319768a(27) =17285917742a(28) =36957928479a(29) =78847115649