Logarithmic g.f.: Sum_{n>=1} a(n)/n*x^n = log(G108626(x)), where G108626(x) is g.f. for A108626.
A108627
Logarithmic g.f.: Sum_{n>=1} a(n)/n*x^n = log(G108626(x)), where G108626(x) is g.f. for A108626.
Terms
- a(0) =2a(1) =6a(2) =20a(3) =66a(4) =222a(5) =750a(6) =2536a(7) =8578a(8) =29018a(9) =98166a(10) =332092a(11) =1123458a(12) =3800630a(13) =12857438a(14) =43496400a(15) =147147266a(16) =497795634a(17) =1684030566a(18) =5697034596a(19) =19272929986a(20) =65199855118a(21) =220569529934a(22) =746181374904
External references
- oeis: A108627