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A152431 Eigentriangle, row sums = A000110, the Bell numbers. 3
1, 1, 1, 2, 1, 2, 6, 2, 2, 5, 22, 6, 4, 5, 15, 92, 22, 12, 10, 15, 52, 426, 92, 44, 30, 30, 52, 203, 2146, 426, 184, 110, 90, 104, 203, 877, 11624, 2146, 852, 460, 330, 312, 406, 877, 4140, 67146, 11624, 4292, 2130, 1380, 1144, 1218, 1754, 4140, 21147 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row sums = the Bell numbers, A000110, starting with offset 1: (1, 2, 5, 15, 52,...).

Left border = A074664 (1, 1, 2, 6, 22 92, 426,...), the INVERTi transform of (1, 2, 5, 15, 52,...).

Sum of n-th row terms = rightmost term of next row.

LINKS

Table of n, a(n) for n=1..55.

FORMULA

Triangle read by rows, M*Q. M = an infinite lower triangular matrix with A074664 in every column: (1, 1, 2, 6, 22, 92, 426,...). Q = a matrix with the Bell numbers (1, 1, 2, 5, 15,...) as the main diagonal and the rest zeros.

EXAMPLE

First few rows of the triangle =

1;

1, 1;

2, 1, 2;

6, 2, 2, 5;

22, 6, 4, 5, 15;

92, 22, 12, 10, 15, 52;

426, 92, 44, 30, 30, 52, 203;

2146, 426, 184, 110, 90, 104, 203, 877;

11624, 2146, 852, 460, 330, 312, 406, 877, 4140;

67146, 11624, 4292, 2130, 1380, 1144, 1218, 1754, 4140, 21147;

411142, 67146, 23248, 10730, 6390, 4784, 4466, 5262, 8280, 21147, 115975;

...

Row 4 = (6, 2, 2, 5) = termwise products of (6, 2, 1, 1) and (1, 1, 2, 5).

CROSSREFS

A000110, A074664

Sequence in context: A265870 A284466 A258615 * A143965 A182073 A098361

Adjacent sequences:  A152428 A152429 A152430 * A152432 A152433 A152434

KEYWORD

eigen,nonn,tabl

AUTHOR

Gary W. Adamson, Dec 04 2008

STATUS

approved

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Last modified October 21 07:06 EDT 2018. Contains 316405 sequences. (Running on oeis4.)