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A160991 Row sums of triangle defined in A112593. 1
1, 3, 15, 25, 42, 74, 96, 126, 156, 177, 268, 393, 293, 527, 573, 732, 623, 772, 887, 903, 1029, 1010, 1333, 1398, 1353, 1594, 2104, 1786, 1923, 1971, 2847, 2744, 2560, 2282, 3128, 3133, 2850, 3634, 3795, 2976, 4212, 4092, 4413, 4596, 4605, 4679, 6177, 5158 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..48.

EXAMPLE

Fifth row is 7, 5, 5, 5, 0, 5, 5, 5, 5, so a(5) = 42.

PROG

(MAGMA) S:=[[1]]; for i in [2..48] do Append(~S, [ &+[ Gcd(S[i-1][k], j) eq 1 select 1 else 0: k in [1..2*i-3] ]: j in [1..2*i-1] ]); end for; [ &+R: R in S ];

CROSSREFS

Cf. A112593.

Sequence in context: A276938 A046280 A046283 * A328387 A006872 A027179

Adjacent sequences:  A160988 A160989 A160990 * A160992 A160993 A160994

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Jun 01 2009

STATUS

approved

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Last modified December 3 21:17 EST 2021. Contains 349468 sequences. (Running on oeis4.)