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A102921
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Column 0 of triangle A102920, which equals the matrix square of A102098.
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3
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1, 3, 36, 1036, 56355, 5045370, 679409158, 129195427716, 33114233390505, 11038606786054201, 4652371578279864792, 2423023045813285312020, 1530233703568825263174101, 1153422053136775523883308988
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OFFSET
| 0,2
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COMMENTS
| Equals the bisection of A102917. Triangle A102098 shifts each column up 1 row under matrix cube.
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PROG
| (PARI) {a(n)=if(n==0, 2, polcoeff(2-sum(k=0, n-1, a(k)*x^k*prod(j=2, k\2+2, 1-j*x +x*O(x^n))), n))} /* at even-indices n=0, 2, 4, .. */
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CROSSREFS
| Cf. A102920, A102098, A102917.
Sequence in context: A004824 A132912 A126447 * A193302 A102579 A136393
Adjacent sequences: A102918 A102919 A102920 * A102922 A102923 A102924
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Jan 21 2005
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