p-INVERT of the positive integers, where p(S) = (1 - S^2)^2.

Terms

a(0) =0a(1) =2a(2) =8a(3) =23a(4) =64a(5) =182a(6) =520a(7) =1475a(8) =4152a(9) =11624a(10) =32408a(11) =90028a(12) =249272a(13) =688140a(14) =1894600a(15) =5203665a(16) =14260968a(17) =39004962a(18) =106486512a(19) =290226621a(20) =789776888a(21) =2146082610a(22) =5823823120a(23) =15784464728a(24) =42731452816a(25) =115556460982a(26) =312175750152a(27) =842537682283