Triangle read by rows: T(n, n-k) = number of k-faces of the concertina n-cube.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =6a(5) =6a(6) =1a(7) =18a(8) =42a(9) =26a(10) =1a(11) =58a(12) =252a(13) =344a(14) =150a(15) =1a(16) =190a(17) =1420a(18) =3380a(19) =3230a(20) =1082a(21) =1a(22) =614a(23) =7770a(24) =29200a(25) =47130a(26) =34452a(27) =9366