This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A266520 E.g.f.: Log( Sum_{n>=0} (n+1)^(2*n) * x^n/n! ). 2
 4, 65, 3252, 319422, 51147492, 12057585792, 3922351554132, 1682965461982320, 921043932965502660, 626381920753520549760, 518386843395242486312436, 513135100084662037473481728, 598802670522558079363471420836, 813678320999818358850938259419136, 1273853548265201707125719549854268820, 2276462439285471707026207820594795624448 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS PROG (PARI) {a(n) = n! * polcoeff( log( sum(m=0, n, (m+1)^(2*m) * x^m/m!) +x*O(x^n)), n)} for(n=1, 20, print1(a(n), ", ")) CROSSREFS Cf. A266519. Sequence in context: A307169 A307185 A206500 * A241705 A015475 A197947 Adjacent sequences:  A266517 A266518 A266519 * A266521 A266522 A266523 KEYWORD nonn AUTHOR Paul D. Hanna, Dec 31 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 6 07:11 EST 2019. Contains 329785 sequences. (Running on oeis4.)