Expansion of 1/(sqrt(1-2*x-3*x^2)*(2-M(x))), where M(x) is the g.f. of the Motzkin numbers A001006.

A116387

Expansion of 1/(sqrt(1-2*x-3*x^2)*(2-M(x))), where M(x) is the g.f. of the Motzkin numbers A001006.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =22a(4) =72a(5) =234a(6) =763a(7) =2486a(8) =8099a(9) =26372a(10) =85833a(11) =279226a(12) =907946a(13) =2951066a(14) =9587981a(15) =31140034a(16) =101104048a(17) =328162170a(18) =1064856217a(19) =3454513274a(20) =11204337056a(21) =36332719182a(22) =117795920249a(23) =381848062066

External references