Number of compositions such that the number of parts is divisible by the first part.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =22a(6) =44a(7) =88a(8) =177a(9) =355a(10) =710a(11) =1419a(12) =2838a(13) =5679a(14) =11363a(15) =22727a(16) =45443a(17) =90862a(18) =181703a(19) =363419a(20) =726903a(21) =1453875a(22) =2907667a(23) =5814880a(24) =11628864a(25) =23256828a(26) =46513965a(27) =93031069a(28) =186068503a(29) =372142797