Number of compositions of n with difference 2 between the number of odd parts and the number of even parts, both counted without multiplicity.
A242842
Number of compositions of n with difference 2 between the number of odd parts and the number of even parts, both counted without multiplicity.
Terms
- a(0) =2a(1) =3a(2) =6a(3) =11a(4) =20a(5) =25a(6) =41a(7) =85a(8) =148a(9) =355a(10) =751a(11) =1701a(12) =3756a(13) =8255a(14) =17513a(15) =37038a(16) =76349a(17) =156618a(18) =317591a(19) =639142a(20) =1279302a(21) =2546711a(22) =5057675a(23) =10010975a(24) =19788607a(25) =39058684a(26) =77055159a(27) =151930328a(28) =299600229a(29) =590849561
External references
- oeis: A242842