a(n) = n! reduced mod 2^n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =8a(4) =24a(5) =16a(6) =48a(7) =128a(8) =384a(9) =768a(10) =1280a(11) =3072a(12) =3072a(13) =10240a(14) =22528a(15) =32768a(16) =98304a(17) =196608a(18) =65536a(19) =262144a(20) =262144a(21) =1572864a(22) =6815744a(23) =12582912a(24) =29360128a(25) =25165824a(26) =8388608a(27) =234881024a(28) =369098752a(29) =335544320