a(n) = 2^n - C(n,0) - C(n,1) - ... - C(n,5).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =8a(8) =37a(9) =130a(10) =386a(11) =1024a(12) =2510a(13) =5812a(14) =12911a(15) =27824a(16) =58651a(17) =121670a(18) =249528a(19) =507624a(20) =1026876a(21) =2069256a(22) =4158861a(23) =8344056a(24) =16721761a(25) =33486026a(26) =67025182a(27) =134116144a(28) =268313018a(29) =536724316