Triangle read by rows: 4th power of the lower triangular mean matrix (M[i,j] = 1/i for i <= j).

Terms

a(0) =1a(1) =15a(2) =1a(3) =575a(4) =65a(5) =8a(6) =5845a(7) =865a(8) =175a(9) =27a(10) =874853a(11) =153713a(12) =39743a(13) =9963a(14) =1728a(15) =1009743a(16) =200403a(17) =60333a(18) =19153a(19) =5368a(20) =1000a(21) =389919909a(22) =84873489a(23) =28400079a(24) =10419739a(25) =3681784a(26) =1105000a(27) =216000a(28) =3449575767a(29) =807843807