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A321958 Sums of antidiagonals of A321960. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

PROG

(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)

CROSSREFS

Cf. A321960.

Sequence in context: A056841 A185040 A208237 * A107112 A193318 A171450

Adjacent sequences:  A321955 A321956 A321957 * A321959 A321960 A321961

KEYWORD

nonn

AUTHOR

Peter Luschny, Dec 27 2018

STATUS

approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)