Hankel transform of a(n) is A006720(n+1). Hankel transform of a(n+1) is A006720(n+3).

A254316

Hankel transform of a(n) is A006720(n+1). Hankel transform of a(n+1) is A006720(n+3).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =78a(6) =299a(7) =1172a(8) =4677a(9) =18947a(10) =77746a(11) =322545a(12) =1350906a(13) =5704822a(14) =24265651a(15) =103872254a(16) =447146683a(17) =1934538301a(18) =8407277728a(19) =36685185300a(20) =160663301053a(21) =705974374128

External references