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A115025
a(n) = n-th element of n-th row of triangle shown below.
1
1, 2, 2, 7, 3, 21, 25, 113, 17, 289, 321, 1665, 769, 5633, 7169, 30721, 2049, 69633, 73729, 409601, 163841, 1376257, 1703937, 7602177, 1572865, 19922945, 23068673, 113246209, 58720257, 385875969, 503316481, 2080374785, 67108865, 4429185025, 4563402753
OFFSET
1,2
COMMENTS
1
1..............................................2
1......................3.......................2.......................4
1...........5..........3...........7...........2...........6...........4...........8
1.....9.....5....13....3....11.....7....15.....2....10.....6....14.....4....12.....8....16
1.17..9.25..5.21.13.29.3.19.11.27..7.23.15.31..2.18.10.26..6.22.14.30..4.20.12.28..8.24.16.32
...
LINKS
CROSSREFS
Cf. A049773.
Sequence in context: A077218 A102780 A227828 * A245286 A075428 A277199
KEYWORD
nonn
AUTHOR
Jonas Wallgren, Feb 24 2006
EXTENSIONS
Offset changed to 1 by Alois P. Heinz, Feb 26 2015
a(16)-a(35) from Alois P. Heinz, Feb 26 2015
STATUS
approved