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 A127631 Square of Riordan array (1,xc(x)) where c(x) is the g.f. of A000108. 1
 1, 0, 1, 0, 2, 1, 0, 6, 4, 1, 0, 21, 16, 6, 1, 0, 80, 66, 30, 8, 1, 0, 322, 280, 143, 48, 10, 1, 0, 1348, 1216, 672, 260, 70, 12, 1, 0, 5814, 5385, 3150, 1344, 425, 96, 14, 1, 0, 25674, 24244 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS Square of A106566. Row sums are A127632. LINKS FORMULA Riordan array (1,x*c(x)*c(x*c(x))) T(n+1,1) = A129442(n) = A121988(n+1). - Philippe Deléham, Feb 27 2013 EXAMPLE Triangle begins 1, 0, 1, 0, 2, 1, 0, 6, 4, 1, 0, 21, 16, 6, 1, 0, 80, 66, 30, 8, 1, 0, 322, 280, 143, 48, 10, 1, 0, 1348, 1216, 672, 260, 70, 12, 1, 0, 5814, 5385, 3150, 1344, 425, 96, 14, 1, 0, 25674, 24244, 14799, 6784, 2400, 646, 126, 16, 1, 0, 115566, 110704, 69828, 33814, 13002, 3960, 931, 160, 18, 1 CROSSREFS Cf. A106566, A121988, A129442. Sequence in context: A275328 A147720 A205813 * A122538 A090238 A047922 Adjacent sequences:  A127628 A127629 A127630 * A127632 A127633 A127634 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Jan 20 2007 STATUS approved

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Last modified October 22 10:57 EDT 2018. Contains 316437 sequences. (Running on oeis4.)