Coefficients in asymptotic expansion of sequence A101880.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =60a(6) =253a(7) =1180a(8) =6023a(9) =33306a(10) =197719a(11) =1250906a(12) =8387942a(13) =59357195a(14) =441685485a(15) =3444965562a(16) =28082207264a(17) =238628007349