Inverse Euler transform of A195980.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =23a(6) =61a(7) =157a(8) =426a(9) =1163a(10) =3253a(11) =9172a(12) =26236a(13) =75634a(14) =220021a(15) =644305a(16) =1898977a(17) =5626720a(18) =16754652a(19) =50104781a(20) =150427938a(21) =453214878a(22) =1369857943a(23) =4152559458a(24) =12621816592a(25) =38459047705a(26) =117453028937a(27) =359455509767