This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A127756 #5 Sep 29 2018 18:46:39 %S A127756 1,1,1,5,18,97,600,4325,35280,322578,3265920,36288097,439084800, %T A127756 5748019800,80951270400,1220496081125,19615115520000,334764638243280, %U A127756 6046686277632000,115242726703426578 %N A127756 Row sums of the inverse of number triangle A(n,k) = 1/n! if k <= n <= 2k, 0 otherwise. %C A127756 Row sums of A127755. a(2n) = A061079(n), n > 0. %K A127756 nonn %O A127756 0,4 %A A127756 _Paul Barry_, Jan 28 2007