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A308126 Positive integers equal to the permanent of Hankel matrix formed by their decimal digits. 1
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 562, 962, 26240, 85440 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..14.

Eric Weisstein's World of Mathematics, Permanent

Wikipedia, Hankel matrix

EXAMPLE

     | 5 6 2 |

perm | 6 2 6 | = 5*2*5 + 6*6*2 + 2*6*6 + 2*2*2 + 6*6*5 + 5*6*6 = 562.

     | 2 6 5 |

MAPLE

with(linalg): P:=proc(q) local c, d, k, n, t: print(0);

for n from 1 to q do c:=convert(n, base, 10): t:=[]:

for k from 1 to nops(c) do t:=[op(t), 0]: od: d:=t: t:=[]:

for k from 1 to nops(c) do t:=[op(t), d]: t[k, -k]:=1: od:

if permanent(evalm(toeplitz(c) &* t))=n then print(n); fi:

od: end: P(10^8);

CROSSREFS

Cf. A306714, A306853.

Sequence in context: A004893 A069282 A069747 * A124107 A257275 A112014

Adjacent sequences:  A308123 A308124 A308125 * A308127 A308128 A308129

KEYWORD

nonn,base,more

AUTHOR

Paolo P. Lava, May 14 2019

STATUS

approved

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Last modified July 13 13:48 EDT 2020. Contains 335688 sequences. (Running on oeis4.)