First differences of A163891.

Terms

a(0) =2a(1) =2a(2) =1a(3) =19a(4) =9a(5) =35a(6) =8a(7) =20a(8) =294a(9) =146a(10) =25a(11) =531a(12) =1a(13) =63a(14) =64a(15) =334a(16) =4688a(17) =2223a(18) =119a(19) =393a(20) =8976a(21) =547a(22) =1064a(23) =79832a(24) =477a(25) =1571a(26) =35842a(27) =6347a(28) =135987a(29) =2