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 A224115 Number of idempotent 4X4 0..n matrices of rank 2. 1
 282, 1434, 4182, 9762, 19110, 34602, 56982, 89766, 134298, 194262, 271074, 371478, 494346, 647358, 833226, 1057542, 1321482, 1636314, 1999926, 2425794, 2913678, 3472242, 4104942, 4828626 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..24. EXAMPLE Some solutions for n=3 ..0..0..0..0....1..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0 ..1..1..0..0....0..1..1..0....1..1..0..0....1..1..0..0....0..1..0..0 ..2..1..0..1....0..0..0..0....0..0..1..0....1..1..0..1....2..2..0..0 ..1..0..0..1....0..3..3..0....0..0..1..0....0..0..0..1....0..3..0..0 CROSSREFS Row 4 of A224114. Sequence in context: A250580 A252364 A345704 * A248459 A172627 A172725 Adjacent sequences: A224112 A224113 A224114 * A224116 A224117 A224118 KEYWORD nonn,more AUTHOR R. H. Hardin, Apr 09 2013 STATUS approved

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Last modified August 7 17:47 EDT 2024. Contains 375017 sequences. (Running on oeis4.)