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A355806
a(n) is the number of odd terms in n-th row of triangle A355802.
2
1, 2, 2, 2, 2, 4, 4, 4, 6, 8, 8, 8, 6, 8, 10, 8, 10, 12, 12, 16, 14, 12, 10, 16, 16, 12, 18, 20, 16, 20, 18, 16, 22, 20, 20, 24, 26, 24, 26, 24, 24, 28, 26, 24, 30, 36, 32, 32, 22, 32, 34, 24, 34, 36, 28, 40, 38, 28, 34, 40, 32, 36, 42, 36, 42, 44, 36, 40, 46
OFFSET
0,2
EXAMPLE
The first terms, alongside the corresponding rows in A355802, are:
n a(n) n-th row of A355802
- ---- ------------------------------
0 1 [1]
1 2 [1, 1]
2 2 [1, 2, 1]
3 2 [1, 2, 2, 1]
4 2 [1, 2, 2, 2, 1]
5 4 [1, 2, 3, 3, 2, 1]
6 4 [1, 2, 3, 4, 3, 2, 1]
7 4 [1, 2, 3, 4, 4, 3, 2, 1]
8 6 [1, 2, 3, 5, 6, 5, 3, 2, 1]
9 8 [1, 2, 3, 5, 7, 7, 5, 3, 2, 1]
PROG
(PARI) See Links section.
CROSSREFS
Cf. A355802.
Sequence in context: A104409 A274144 A214628 * A032576 A276420 A239494
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Jul 18 2022
STATUS
approved