0,8

The column sequences (without leading zeros) are A000012, A000108(Catalan), A015083-86, A015089, A015091-93, A015095, A015096 for k=0..11.

Triangle begins :

1 ;

1, 1 ;

1, 1, 1 ;

1, 2, 1, 1 ;

1, 5, 3, 1, 1 ;

1, 14, 17, 4, 1, 1 ;

1, 42, 171, 43, 5, 1, 1 ;

1, 132, 3113, 1252, 89, 6, 1, 1 ;

1, 429, 106419, 104098, 5885, 161, 7, 1, 1 ;

1, 1430, 7035649, 25511272, 1518897, 20466, 265, 8, 1, 1 ;

This sequence formatted as a square array :

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ...

1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, ...

1, 1, 3, 17, 171, 3113, 106419, 7035649, 915028347, 23601213721, 121358931877763, ...

1, 1, 4, 43, 1252, 104098, 25511272, 18649337311, 40823535032644, 267924955577741566, ...

1, 1, 5, 89, 5885, 1518897, 1558435125, 6386478643785, 104648850228298925, ...

1, 1, 6, 161, 20466, 12833546, 40130703276, 627122621447281, 48995209411107768186, ...

Sequence in context: A066060 A008550 A064094 this_sequence A111673 A121391 A008326

Adjacent sequences: A090179 A090180 A090181 this_sequence A090183 A090184 A090185

easy,nonn,tabl

DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Jan 20 2004, Oct 16 2008