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EXAMPLE
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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, ...
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