Number of labeled pure 2-complexes on n nodes with 3 2-simplexes.

Terms

a(0) =4a(1) =120a(2) =1140a(3) =6545a(4) =27720a(5) =95284a(6) =280840a(7) =735130a(8) =1750540a(9) =3858140a(10) =7971964a(11) =15596035a(12) =29112720a(13) =52174360a(14) =90223760a(15) =151173044a(16) =246274580a(17) =391222160a(18) =607525380a(19) =924205205a(20) =1379864024a(21) =2025189100a(22) =2925954200a(23) =4166590350