First differences (A131771) equal this sequence with terms repeated at positions: {m*(m+1)/2, m>=0}.

A131770

First differences (A131771) equal this sequence with terms repeated at positions: {m*(m+1)/2, m>=0}.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =8a(4) =12a(5) =20a(6) =32a(7) =52a(8) =72a(9) =104a(10) =156a(11) =228a(12) =332a(13) =436a(14) =592a(15) =820a(16) =1152a(17) =1588a(18) =2180a(19) =2772a(20) =3592a(21) =4744a(22) =6332a(23) =8512a(24) =11284a(25) =14876a(26) =18468a(27) =23212a(28) =29544a(29) =38056

External references