Number of compositions of n with equal differences up to sign.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =8a(6) =13a(7) =12a(8) =20a(9) =24a(10) =25a(11) =29a(12) =49a(13) =40a(14) =50a(15) =64a(16) =86a(17) =80a(18) =105a(19) =102a(20) =164a(21) =175a(22) =186a(23) =208a(24) =325a(25) =316a(26) =382a(27) =476a(28) =624a(29) =660