Number of alternately co-strong compositions of n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =12a(6) =24a(7) =39a(8) =72a(9) =125a(10) =224a(11) =387a(12) =697a(13) =1205a(14) =2141a(15) =3736a(16) =6598a(17) =11516a(18) =20331a(19) =35526a(20) =62507a(21) =109436a(22) =192200a(23) =336533a(24) =590582a(25) =1034187