Third convolution of Lucas numbers A000032(n+1), n >= 0.

Terms

a(0) =1a(1) =12a(2) =70a(3) =280a(4) =905a(5) =2568a(6) =6666a(7) =16220a(8) =37580a(9) =83780a(10) =181074a(11) =381488a(12) =786715a(13) =1593160a(14) =3176210a(15) =6246732a(16) =12139859a(17) =23344760a(18) =44471340a(19) =84005640a(20) =157483176a(21) =293201912a(22) =542468100a(23) =997906400a(24) =1826073525