cp's OEIS Frontend

A321958 Sums of antidiagonals of A321960.

%I A321958 #7 Jan 07 2019 02:47:31
%S A321958 1,1,2,5,15,54,227,1085,5774,33679,212807,1443622,10439565,80016693,
%T A321958 646976322,5496339141,48894262619,454113866430,4392175247939,
%U A321958 44138842357617,459956754593094,4961220069886511,55301147935270395,636091223462294518,7539926971001192381
%N A321958 Sums of antidiagonals of A321960.
%H A321958 Vaclav Kotesovec, <a href="/A321958/b321958.txt">Table of n, a(n) for n = 0..200</a>
%o A321958 (Sage)
%o A321958 def A321958List(l):
%o A321958     def row(n, dim):
%o A321958         m = 1
%o A321958         for k in range(dim-1, -1, -1):
%o A321958             ax = (n+k)*x
%o A321958             m = 1 - ax - (ax*x)/m
%o A321958         return SR(1/m).series(x, dim).list()
%o A321958     return [sum(row(n-k, n+1)[k] for k in (0..n)) for n in (0..l-1)]
%o A321958 A321958List(16)
%Y A321958 Cf. A321960.
%K A321958 nonn
%O A321958 0,3
%A A321958 _Peter Luschny_, Dec 27 2018