Number of partitions of n that contain exactly two isolated singletons.

Terms

a(0) =1a(1) =0a(2) =2a(3) =2a(4) =7a(5) =12a(6) =32a(7) =67a(8) =169a(9) =390a(10) =985a(11) =2412a(12) =6209a(13) =15871a(14) =41867a(15) =110797a(16) =299836a(17) =817612a(18) =2268640a(19) =6354409a(20) =18058764a(21) =51838340a(22) =150704087a(23) =442550971a(24) =1314527780a(25) =3943140077a(26) =11953192954a(27) =36580095663a(28) =113048257691a(29) =352564213025