First differences of A066841.

Terms

a(0) =1a(1) =1a(2) =13a(3) =-11a(4) =427a(5) =-425a(6) =2041a(7) =-1805a(8) =7757a(9) =-7989a(10) =143327221a(11) =-143327219a(12) =87795a(13) =367817a(14) =66653239a(15) =-67108847a(16) =117546246127a(17) =-117546246125a(20) =-10301185a(21) =-5451753a(24) =35917523