111669149696domain: NAppears in sequencesDenominators of coefficients of 1/2^(2n+1) in Newton's series for Pi.at n=19A054388Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.at n=19A121138Hankel transform of Thue-Morse related sequence A106400.at n=34A186026