Principal diagonal of the convolution array A213844.

Terms

a(0) =3a(1) =32a(2) =119a(3) =296a(4) =595a(5) =1048a(6) =1687a(7) =2544a(8) =3651a(9) =5040a(10) =6743a(11) =8792a(12) =11219a(13) =14056a(14) =17335a(15) =21088a(16) =25347a(17) =30144a(18) =35511a(19) =41480a(20) =48083a(21) =55352a(22) =63319a(23) =72016a(24) =81475a(25) =91728a(26) =102807a(27) =114744a(28) =127571a(29) =141320