a(n) = 2^n - C(n,0) - C(n,1) - ... - C(n,6).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =9a(9) =46a(10) =176a(11) =562a(12) =1586a(13) =4096a(14) =9908a(15) =22819a(16) =50643a(17) =109294a(18) =230964a(19) =480492a(20) =988116a(21) =2014992a(22) =4084248a(23) =8243109a(24) =16587165a(25) =33308926a(26) =66794952a(27) =133820134a(28) =267936278a(29) =536249296