Irregular triangle read by rows: T(n,k) (n>=2, 0<=k<=n) = total number of unbranched k-catapolyheptagons with k pentagons and n-k heptagons.

A323850

Irregular triangle read by rows: T(n,k) (n>=2, 0<=k<=n) = total number of unbranched k-catapolyheptagons with k pentagons and n-k heptagons.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =3a(6) =1a(7) =6a(8) =12a(9) =16a(10) =6a(11) =2a(12) =20a(13) =58a(14) =82a(15) =53a(16) =18a(17) =3a(18) =72a(19) =256a(20) =432a(21) =352a(22) =174a(23) =40a(24) =6a(25) =272a(26) =1160a(27) =2208a(28) =2256a(29) =1380

External references