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A257608 Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 9*x + 1. 2
1, 1, 1, 1, 20, 1, 1, 219, 219, 1, 1, 2218, 8322, 2218, 1, 1, 22217, 220222, 220222, 22217, 1, 1, 222216, 5006247, 12332432, 5006247, 222216, 1, 1, 2222215, 105340629, 530539235, 530539235, 105340629, 2222215, 1, 1, 22222214, 2123693776, 19700767514, 39259903390, 19700767514, 2123693776, 22222214, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Row sums are: 1, 2, 22, 440, 12760, 484880, ... (see A084949).

LINKS

Table of n, a(n) for n=0..44.

G. Strasser, Generalisation of the Euler adic, Math. Proc. Camb. Phil. Soc. 150 (2010) 241-256, Triangle A_9(n,k).

EXAMPLE

1

1 1

1 20 1

1 219 219 1

1 2218 8322 2218 1

1 22217 220222 220222 22217 1

1 222216 5006247 12332432 5006247 222216 1

1 2222215 105340629 530539235 530539235 105340629 2222215 1

1 22222214 2123693776 19700767514 39259903390 19700767514 2123693776 22222214 1

CROSSREFS

Cf. A257619

Cf. A144431, A007318, A008292, A060187, A142458, A142459, A142460, A142461, A142462, A167884

Similar sequences listed in A256890.

Sequence in context: A155516 A174674 A144443 * A022183 A015146 A064033

Adjacent sequences:  A257605 A257606 A257607 * A257609 A257610 A257611

KEYWORD

nonn,tabl

AUTHOR

Dale Gerdemann, May 03 2015

STATUS

approved

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Last modified February 27 09:59 EST 2020. Contains 332302 sequences. (Running on oeis4.)