Principal diagonal of the convolution array A213774.

Terms

a(0) =1a(1) =11a(2) =38a(3) =97a(4) =213a(5) =432a(6) =833a(7) =1555a(8) =2838a(9) =5097a(10) =9045a(11) =15904a(12) =27761a(13) =48171a(14) =83174a(15) =143009a(16) =244997a(17) =418384a(18) =712465a(19) =1210195a(20) =2050966a(21) =3468681a(22) =5855333a(23) =9867072a(24) =16600993a(25) =27889547a(26) =46790438a(27) =78401185a(28) =131212533a(29) =219355632