Number of Goldbach partitions of 4^n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =8a(5) =22a(6) =53a(7) =151a(8) =435a(9) =1314a(10) =4239a(11) =13705a(12) =45746a(13) =153850a(14) =525236a(15) =1817111a(16) =6341424a(17) =22336060a(18) =79287664a(19) =283277225a(20) =1018369893