A129103 - OEIS

This site is supported by donations to The OEIS Foundation.

A129103

Column 3 of triangle A129100; also equals column 0 of matrix power A129100^8.

1, 8, 72, 880, 16032, 461992, 21944520, 1770483408, 248136807776, 61460157645704, 27267123945408968, 21902527945097597616, 32134030755805852610720, 86739696410985770930422760 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	PROG	`(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+4, B=matrix(m, m); for(r=1, m, for(c=1, r, if(r==c\|r==1\|r==2, B[r, c]=1, if(c==1, B[r, 1]=sum(i=1, r-1, A[r-1, i]), B[r, c]=(A^(2^(c-1)))[r-c+1, 1])); )); A=B); return(A[n+4, 4])}`
	CROSSREFS	`Cf. A129100 (triangle); A129092 (column 0), A129101 (column 1), A129102 (column 2).` `Sequence in context: A049388 A014479 A013992 * A111812 A138433 A001799` `Adjacent sequences: A129100 A129101 A129102 * A129104 A129105 A129106`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 29 2007`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 10:05 EST 2012. Contains 206009 sequences.