A322046 Irregular triangle read by rows: a Pascal "rhombus", third in the sequence after A059317 and A027907.

1, 1, 1, 1, 1, 2, 4, 2, 1, 1, 3, 8, 10, 8, 3, 1, 1, 4, 13, 24, 31, 24, 13, 4, 1, 1, 5, 19, 45, 78, 93, 78, 45, 19, 5, 1, 1, 6, 26, 74, 158, 248, 290, 248, 158, 74, 26, 6, 1

Offset

0,6

Links

Table of n, a(n) for n=0..48.

Sheng-Liang Yang and Yuan-Yuan Gao, The Pascal rhombus and Riordan arrays, Fib. Q., 56:4 (2018), 337-347. See Fig. 4.

Example

Triangle begins:
  1,
  1,1,1,
  1,2,4,2,1,
  1,3,8,10,8,3,1,,
  1,4,13,24,31,24,13,4,1,,
  1,5,19,45,78,93,78,45,19,5,1,,
  1,6,26,74,158,248,290,248,158,74,26,6,1,
  ...

Crossrefs

Cf. A059317 and A027907.

Sequence in context: A225812 A132823 A059317 * A247644 A220886 A256156

Adjacent sequences: A322043 A322044 A322045 * A322047 A322048 A322049

Keyword

nonn,tabf,more

Author

N. J. A. Sloane, Dec 07 2018

Status

approved