First differences of harmonic (or Ore) numbers A001599.

Terms

a(0) =5a(1) =22a(2) =112a(3) =130a(4) =226a(5) =176a(6) =966a(7) =1332a(8) =3230a(9) =1928a(10) =62a(11) =10410a(12) =20a(13) =9226a(14) =2394a(15) =2520a(16) =23100a(17) =49804a(18) =12136a(19) =49600a(20) =6200a(21) =63910a(22) =4550a(23) =90580a(24) =27720a(25) =179040a(26) =156120a(27) =30660a(28) =27300a(29) =197496