Apply partial sum operator twice to A000594.

Terms

a(0) =1a(1) =-22a(2) =207a(3) =-1036a(4) =2551a(5) =90a(6) =-19115a(7) =46160a(8) =-2208a(9) =-166496a(10) =203828a(11) =203208a(12) =-375150a(13) =-551652a(14) =489006a(15) =2516800a(16) =-2361340a(17) =-4512048a(18) =3998664a(19) =5399616a(20) =2581080a(21) =-13068144a(22) =-10074096a(23) =14208912a(24) =12992695a(25) =25642190a(26) =-34987395a(27) =-70969812a(28) =21454401a(29) =84666774