Even numbers in A221715.

Terms

a(0) =20a(1) =192a(2) =352a(3) =104a(4) =736a(5) =264a(6) =64a(7) =464a(8) =1088a(9) =640a(10) =1344a(11) =800a(12) =3136a(13) =896a(14) =1952a(15) =2496a(16) =22272a(17) =2752a(18) =1728a(19) =1504a(20) =8576a(21) =4480a(22) =3520a(23) =12672a(24) =7552a(25) =4160a(26) =3840a(27) =11520a(28) =2304a(29) =19712