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 A137593 Triangle read by rows: matrix product A000012 * A136717. 2
 1, 1, 2, 1, 4, 4, 1, 4, 16, 12, 1, 4, 16, 84, 48, 1, 4, 16, 156, 504, 192, 1, 4, 16, 156, 1464, 3312, 960, 1, 4, 16, 156, 1464, 14112, 24720, 5760, 1, 4, 16, 156, 1464, 24912, 158640, 189360, 34560, 1, 4, 16, 156, 1464, 24912, 400560, 1761840, 1607040, 241920 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Right border = A004527: (1, 2, 4, 12, 48, 192,...). Row sums = A007489 starting (1, 3, 9, 33, 153,...). LINKS FORMULA A000012 * A136717 as infinite lower triangular matrices. EXAMPLE First few rows of the triangle are: 1; 1, 2; 1, 4, 4; 1, 4, 16, 12; 1, 4, 16, 84, 48; 1, 4, 16, 156, 504, 192; 1, 4, 16, 156, 1464, 3312, 960; ... CROSSREFS Cf. A136717, A004527, A007489. Sequence in context: A274980 A274826 A129862 * A009949 A070785 A214985 Adjacent sequences:  A137590 A137591 A137592 * A137594 A137595 A137596 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Jan 28 2008 EXTENSIONS Typo in eighth row corrected by Olivier Gérard, Oct 30 2012 STATUS approved

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