A115025 a(n) = n-th element of n-th row of triangle shown below.

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

Alois P. Heinz, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A049773.

Sequence in context: A077218 A102780 A227828 * A245286 A075428 A277199

Adjacent sequences: A115022 A115023 A115024 * A115026 A115027 A115028

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