A321958 Sums of antidiagonals of A321960.

1, 1, 2, 5, 15, 54, 227, 1085, 5774, 33679, 212807, 1443622, 10439565, 80016693, 646976322, 5496339141, 48894262619, 454113866430, 4392175247939, 44138842357617, 459956754593094, 4961220069886511, 55301147935270395, 636091223462294518, 7539926971001192381

Offset: 0

Author

Peter Luschny, Dec 27 2018

Keywords

• nonn

Links

• Vaclav Kotesovec, Table of n, a(n) for n = 0..200

Crossrefs

Cf. A321960.

Programs

Sage

def A321958List(l):
    def row(n, dim):
        m = 1
        for k in range(dim-1, -1, -1):
            ax = (n+k)*x
            m = 1 - ax - (ax*x)/m
        return SR(1/m).series(x, dim).list()
    return [sum(row(n-k, n+1)[k] for k in (0..n)) for n in (0..l-1)]
A321958List(16)