(1/10) times the sum of the elements of all subsets of [n] whose sum is divisible by ten.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =3a(6) =7a(7) =17a(8) =46a(9) =116a(10) =284a(11) =677a(12) =1595a(13) =3730a(14) =8610a(15) =19680a(16) =44580a(17) =100272a(18) =224144a(19) =498104a(20) =1101072a(21) =2422264a(22) =5305804a(23) =11576316a(24) =25165920a(25) =54526160a(26) =117776220a(27) =253671540a(28) =544924088a(29) =1167694512