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

0,3

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: A185040 A369599 A208237 * A107112 A193318 A171450

Adjacent sequences: A321955 A321956 A321957 * A321959 A321960 A321961

Keyword

nonn

Author

Peter Luschny, Dec 27 2018

Status

approved