A004098 Bell numbers written backwards.

1, 1, 2, 5, 51, 25, 302, 778, 414, 74112, 579511, 75876, 7953124, 73444672, 223998091, 5458592831, 74124108401, 40896846828, 951608670286, 7505022472385, 27353285142715, 157651618968474, 3237448375176054, 64348055850025144, 982508492968859544

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• base

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..576

Crossrefs

Cf. A000110, A004086.

Programs

Magma

[Seqint(Reverse(Intseq(Bell(n)))): n in [0..30]]; // Vincenzo Librandi, Jan 30 2015

Maple

b:= proc(n) option remember; `if`(n=0, 1,
      add(b(n-j)*binomial(n-1, j-1), j=1..n))
    end:
a:= n-> (s-> parse(cat(seq(s[-i], i=1..length(s)))))(""||(b(n))):
seq(a(n), n=0..30);  # Alois P. Heinz, Apr 01 2018

Mathematica

FromDigits[Reverse[IntegerDigits[#]]]&/@BellB[Range[0,30]] (* Harvey P. Dale, Feb 01 2012 *)

Formula

a(n) = A004086(A000110(n)). - Michel Marcus, Apr 05 2014

Extensions

More terms from Eric M. Schmidt, Apr 04 2014