OFFSET
1,2
COMMENTS
LINKS
Reinhard Zumkeller, Rows n = 1..120 of triangle, flattened
EXAMPLE
The triangle begins:
. 1: 1
. 2: 3 4
. 3: 7 7 9
. 4: 13 12 13 16
. 5: 21 19 19 21 25
. 6: 31 28 27 28 31 36
. 7: 43 39 37 37 39 43 49
. 8: 57 52 49 48 49 52 57 64
. 9: 73 67 63 61 61 63 67 73 81
. 10: 91 84 79 76 75 76 79 84 91 100
. 11: 111 103 97 93 91 91 93 97 103 111 121
. 12: 133 124 117 112 109 108 109 112 117 124 133 144 .
PROG
(Haskell)
a215630 n k = a215630_tabl !! (n-1) !! (k-1)
a215630_row n = a215630_tabl !! (n-1)
a215630_tabl = zipWith3 (zipWith3 (\u v w -> u - v + w))
a093995_tabl a075362_tabl a133819_tabl
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Reinhard Zumkeller, Nov 11 2012
STATUS
approved