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A098975 Nonzero elements of table A071675; also counts selected ordered multisets of the values {1,2,3}. 0
1, 1, 1, 1, 1, 2, 1, 3, 3, 1, 2, 6, 4, 1, 1, 7, 10, 5, 1, 6, 16, 15, 6, 1, 3, 19, 30, 21, 7, 1, 1, 16, 45, 50, 28, 8, 1, 10, 51, 90, 77, 36, 9, 1, 4, 45, 126, 161, 112, 45, 10, 1, 1, 30, 141, 266, 266 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..56.

EXAMPLE

Shift A027907 as indicated and construct a(n) by column. The table begins

1

. 1 1 1

. . 1 2 3 2 1

. . . 1 3 6 7 6 3 1

. . . . 1 4 10 16 19 16 10 4 1

. . . . . 1 5 15 30 45 51 45 30 15 5 1

. . . . . . 1

therefore a(19) = 6 and appears in column seven and row three. a(19) counts the ordered multisets {133,313,331,223,232,322).

CROSSREFS

Cf. A000073, A027907, A071675, A098925.

Sequence in context: A229742 A126572 A162910 * A309213 A127121 A238703

Adjacent sequences:  A098972 A098973 A098974 * A098976 A098977 A098978

KEYWORD

nonn

AUTHOR

Alford Arnold, Oct 23 2004

STATUS

approved

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)