Irregular triangle read by rows: the number of hydrocarbon structures that can be drawn with a given number of carbons and units of unsaturation.

A134819

Irregular triangle read by rows: the number of hydrocarbon structures that can be drawn with a given number of carbons and units of unsaturation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =2a(8) =1a(9) =2a(10) =5a(11) =9a(12) =11a(13) =7a(14) =3a(15) =3a(16) =10a(17) =26a(18) =40a(19) =40a(20) =21a(21) =6a(22) =5a(23) =25a(24) =77a(25) =159a(26) =217a(27) =185a(28) =85a(29) =19

External references