Product of a prime and the previous number.

Terms

a(0) =2a(1) =6a(2) =20a(3) =42a(4) =110a(5) =156a(6) =272a(7) =342a(8) =506a(9) =812a(10) =930a(11) =1332a(12) =1640a(13) =1806a(14) =2162a(15) =2756a(16) =3422a(17) =3660a(18) =4422a(19) =4970a(20) =5256a(21) =6162a(22) =6806a(23) =7832a(24) =9312a(25) =10100a(26) =10506a(27) =11342a(28) =11772a(29) =12656