Theta series of shadow of lattice described in A014711.

Terms

a(0) =0a(1) =0a(2) =0a(3) =256a(4) =2304a(5) =9216a(6) =28672a(7) =96768a(8) =276480a(9) =563200a(10) =1032192a(11) =2292480a(12) =4746240a(13) =7382016a(14) =10838016a(15) =20110848a(16) =35536896a(17) =48273408a(18) =63078400a(19) =105166080a(20) =169385472a(21) =211988480a(22) =256757760a(23) =400559616