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

Terms

a(0) =1a(1) =9a(2) =39a(3) =120a(4) =315a(5) =753a(6) =1687a(7) =3612a(8) =7470a(9) =15040a(10) =29634a(11) =57366a(12) =109421a(13) =206115a(14) =384105a(15) =709152a(16) =1298613a(17) =2360943a(18) =4264835a(19) =7659870a(20) =13686456a(21) =24340184a(22) =43102644a(23) =76031100a(24) =133636825a(25) =234116493a(26) =408900987