Number of subsets of {1,2,3,...,n} that sum to 0 mod 25.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =10a(9) =23a(10) =43a(11) =82a(12) =164a(13) =328a(14) =656a(15) =1312a(16) =2622a(17) =5243a(18) =10486a(19) =20972a(20) =41945a(21) =83887a(22) =167773a(23) =335546a(24) =671092a(25) =1342184a(26) =2684360a(27) =5368712a(28) =10737422a(29) =21474842