First differences (A131772) equal this sequence with zeros inserted at positions {m*(m+1)/2, m>=0}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =4a(5) =8a(6) =12a(7) =20a(8) =20a(9) =32a(10) =52a(11) =72a(12) =104a(13) =104a(14) =156a(15) =228a(16) =332a(17) =436a(18) =592a(19) =592a(20) =820a(21) =1152a(22) =1588a(23) =2180a(24) =2772a(25) =3592a(26) =3592a(27) =4744a(28) =6332a(29) =8512