a(n) = 1*2 + 3*4 + 5*6 + 7*8 + 9*10 + 11*12 + 13*14 + ... + (up to n).

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =19a(5) =44a(6) =51a(7) =100a(8) =109a(9) =190a(10) =201a(11) =322a(12) =335a(13) =504a(14) =519a(15) =744a(16) =761a(17) =1050a(18) =1069a(19) =1430a(20) =1451a(21) =1892a(22) =1915a(23) =2444a(24) =2469a(25) =3094a(26) =3121a(27) =3850a(28) =3879a(29) =4720